Series of related matters

"Series of related matters" is an aggregation trigger that treats claims as a single claim where they arise from the same act or omission, or from similar acts or omissions, occurring in a series of separate matters that share a relevant connection.

Definition §

The phrase "series of related matters" is a unifying factor used in aggregation clauses, particularly those imposed by professional regulators on the minimum policy wordings that practitioners must hold. A "matter" in this context typically describes a discrete instruction, retainer, file or piece of work, and a series of related matters is therefore a sequence of such pieces of work which are connected to one another in some way that the wording recognises. ^[1]

The trigger usually appears in combination with two further elements. The first is the requirement that the same act or omission, or similar acts or omissions, must run through the series of matters — in other words the relevant misconduct or mistake must be replicated across the series. The second is that the matters must be related; the policy does not aggregate every set of files in which the same kind of error happens, only those files which are connected to one another in a way that goes beyond the existence of the error itself. ^[2]

The leading current authority on what makes matters "related" is the Supreme Court's decision in AIG Europe Ltd v Woodman [2017] UKSC 18, considered in detail below. Lord Toulson's intrinsic-relationship test, although delivered in the context of "series of related transactions" wording, is generally read across to the closely related "series of related matters" wording in the same SRA Minimum Terms clause. ^[3]

Legal / Regulatory basis §

The SRA Minimum Terms and Conditions of Professional Indemnity Insurance contain a composite aggregation provision that defines one claim to include all claims arising from one act or omission, one series of related acts or omissions, the same act or omission in a series of related matters or transactions, and similar acts or omissions in a series of related matters or transactions where there is a connection between them. The trigger considered in this article is one limb of that composite. ^[4]

The Supreme Court in AIG Europe Ltd v Woodman [2017] UKSC 18 was directly concerned with the fourth limb (similar acts or omissions in a series of related transactions). Lord Toulson held that for transactions to be related, there must be an intrinsic relationship between them — not merely a relationship arising because they shared a common feature such as the same lawyer, the same advice or the same kind of error. The Court rejected the Court of Appeal's narrower test which required the transactions to be conditional or dependent on one another. The Supreme Court's approach is generally understood to apply equally to the "series of related matters" formulation. ^[5]

Prior to AIG v Woodman, the Commercial Court had considered similar wording in Countrywide Assured Group plc v Marshall [2002] EWHC 2082 (Comm), which addressed the aggregation of mis-selling claims against an independent financial adviser. The decision pre-dated the modern intrinsic-relationship test but remains a useful illustration of the kinds of factual connections that may or may not be sufficient. ^[6]

Cultural Foundation v Beazley Furlonge Ltd [2018] EWHC 1083 (Comm) applied AIG v Woodman in a construction professional services context shortly after the Supreme Court decision and offers a worked example of how the intrinsic-relationship test is operated in practice. ^[7]

The Court of Appeal in Spire Healthcare Ltd v Royal & Sun Alliance Insurance plc [2022] EWCA Civ 17 returned to aggregation in the context of healthcare claims and confirmed that the proper approach remains to read the wording carefully and apply it to the facts, rather than to reach for general doctrines independent of the policy language. ^[8]

The Solicitors Act 1974 provides the statutory framework under which the SRA prescribes the Minimum Terms, although the Act itself does not specify aggregation wording. The Insurance Act 2015 provides the general law of construction within which the clause operates. ^[9]

How it works in practice §

A "series of related matters" analysis typically begins by identifying the discrete files or instructions said to constitute the series. The starting point is factual: how many client matters are involved, what was the nature of the instructions, and what error or misconduct is alleged in each.

The second step considers the act or omission that runs through the series. The wording usually requires either the same act or omission or similar acts or omissions; the precise requirement depends on the limb of the clause being invoked. A single act, such as one defective opinion drafted once and repeated across many files, will satisfy the same-act formulation. A pattern of repeated but not identical errors may satisfy the similar-acts formulation, but only if combined with the necessary relationship between the matters.

The third and decisive step considers whether the matters are themselves related. After AIG v Woodman, the relationship must be intrinsic. Lord Toulson explained that the inquiry is fact-sensitive and that the matters must have an internal connection with one another, not merely a connection through a common external factor. The fact that several clients used the same firm of solicitors, or that the same partner advised on a number of files, is not by itself sufficient. ^[10]

Where the test is satisfied, the consequences are significant. All the claims in the series are treated as one for the purposes of the per-claim limit and the per-claim excess. In SRA MTC policies, where the aggregate limit is often absent for the basic layer, this can compress what would otherwise be very substantial cover into a single per-claim allocation.

Common variations §

Although the SRA MTC wording is the most prominent example, similar formulations are used in other professional regulatory minimum wordings and in the open market. RICS minimum policy wording for chartered surveyors contemplates aggregation by reference to common causes and series of related matters, with the precise drafting left to insurers within the regulator's framework. ^[11]

Open market wordings for accountants, financial advisers and other regulated professionals frequently use a variant of the "series of related matters" formulation, sometimes coupled with an originating cause trigger to provide a broader catch-all. The interaction between the two triggers determines the practical scope of aggregation.

Some wordings impose a temporal limit on the series, for example by requiring the matters to occur within a defined period. This narrows the scope of aggregation by excluding historic matters from the series. Other wordings impose no temporal limit, leaving the question of remoteness to the court.

Example §

A medium-sized solicitors' firm advises forty separate residential property buyers on the legal effect of a particular type of overage clause. The senior partner responsible for the conveyancing department has adopted a single standard form of advice on the clause, which understates the financial exposure. Each of the forty buyers later suffers loss when overage payments fall due.

The firm's policy is written on SRA Minimum Terms with illustrative limits of £3,000,000 per claim and a £25,000 per-claim excess.

In assessing aggregation, the claims handler will consider whether the forty conveyancing files constitute a series of related matters in which the same or similar acts or omissions have occurred. The act or omission — giving incorrect standard advice on the overage clause — is the same or similar in each case. The harder question is whether the forty separate house purchases are related in the sense required by AIG v Woodman.

If the purchases were unconnected (different buyers, different sellers, different properties, different developments), an intrinsic relationship between the matters is unlikely to be established and the claims would not aggregate. If, however, the forty buyers purchased plots in the same development from the same seller pursuant to a common scheme, the matters may have the intrinsic relationship required, and the claims may aggregate to a single £3,000,000 limit with one £25,000 excess.

These figures are illustrative; the precise outcome depends on the wording and on the facts.

See also §

• /wiki/aggregation-clause/ — the mechanism in which this trigger sits
• /wiki/series-of-related-transactions/ — closely related SRA MTC trigger
• /wiki/originating-cause/ — broader unifying factor
• /wiki/single-act-or-omission/ — narrower alternative
• /wiki/per-claim-limit/ — financial control that aggregation engages
• /wiki/solicitors-indemnity-fund/ — historical context for solicitors' PI
• /wiki/professional-indemnity-insurance/ — the line of business

References §

1. ↑ SRA Minimum Terms and Conditions of Professional Indemnity Insurance — https://www.sra.org.uk/solicitors/standards-regulations/indemnity-insurance-rules/
2. ↑ AIG Europe Ltd v Woodman [2017] UKSC 18 — https://www.supremecourt.uk/cases/uksc-2016-0033.html
3. ↑ Countrywide Assured Group plc v Marshall [2002] EWHC 2082 (Comm)
4. ↑ Cultural Foundation v Beazley Furlonge Ltd [2018] EWHC 1083 (Comm)
5. ↑ Spire Healthcare Ltd v Royal & Sun Alliance Insurance plc [2022] EWCA Civ 17 — https://www.bailii.org/ew/cases/EWCA/Civ/2022/17.html
6. ↑ Solicitors Act 1974 — https://www.legislation.gov.uk/ukpga/1974/47
7. ↑ Insurance Act 2015 — https://www.legislation.gov.uk/ukpga/2015/4