Category: Insurance case law · Reviewed by Jake Leat, Associate Director · Last reviewed June 2026
The leading House of Lords authority on “event”-based aggregation, holding that pensions mis-selling claims arising from many separate sales did not aggregate into “one event” despite a common cause in inadequate training.
The litigation arose out of the pensions mis-selling scandal of the late 1980s and 1990s. Following the Financial Services Act 1986 and the introduction of personal pensions, many individuals in occupational pension schemes were advised by tied agents and bank-employed advisers to transfer out of those schemes into personal pensions. Subsequent regulatory review found a substantial proportion of such transfers and opt-outs had been unsuitable, and the industry was required to pay redress to affected customers.
Lloyds Bank, through its in-house sales force, mis-sold a large number of pension products. It became liable to pay compensation to its customers under the industrywide pensions review. The total redress bill ran into many tens of millions of pounds.
Lloyds Bank’s professional indemnity insurance was provided by a captive insurer within the group, Lloyds Bank Group Insurance Co Ltd, with excess of loss reinsurance above the captive’s retention. The policy contained an excess provision applied to “any claim or claims arising from one originating cause” — and importantly, an aggregation provision tied to “any one event” with a per-event deductible.
The bank sought to aggregate all of the mis-selling claims into one or a small number of “events” so that a single deductible applied. The captive resisted. The economic stakes were substantial because each separate “event” attracted its own deductible.
At first instance the court rejected aggregation; the Court of Appeal also rejected aggregation; the matter then went to the House of Lords.
The central issue was whether thousands of separate mis-selling transactions could be aggregated into “one event” within the meaning of the policy. More precisely, the House of Lords had to decide whether a common underlying cause — here, the bank’s failure to train its sales force properly and a defective sales process — could constitute the relevant “event” for aggregation purposes, or whether each individual sale, made by a different adviser to a different customer on a different day, was its own event. The issue mattered because the language used was “event”-based rather than “originating cause”-based, and the case fell to be decided on the relatively narrow event formulation rather than on the broader source-of-loss language considered in cases such as Axa Reinsurance v Field.
The House of Lords unanimously dismissed Lloyds Bank’s appeal and held that the mis-selling claims did not aggregate into one event.
Their Lordships drew a careful distinction between “originating cause” wording and “event” wording. An “event” is something that happens at a particular time, at a particular place, in a particular way. A cause, by contrast, can be a continuing state of affairs or an omission lacking specific temporal and locational features. Aggregation language using the word “event” must therefore be construed more narrowly than wording referring to causes or sources.
Lord Hoffmann (with whom the other members of the House agreed) emphasised that what was needed for aggregation was a “unity” of time, place and cause sufficient to constitute one event. A general failure to train staff properly was not such an event. Each sale was a separate transaction conducted by different individuals at different times and places.
The court further considered, and rejected, the argument that the regulatory review or the bank’s collective response to it could be treated as a single event. Those features were extrinsic to the underlying liability-generating sales conduct.
The decision was a substantial commercial loss for the bank and a substantial gain for its captive and its reinsurers.
Where an aggregation clause uses the word “event”, that word imports the requirement of something happening at a particular time, place and in a particular way. A common underlying cause, a course of conduct, or a generalised failure of systems or training is not itself an event and cannot found aggregation. “Event”-based wording is therefore narrower than “originating cause” wording, and the distinction must be respected as a matter of contractual construction.
Lloyds TSB remains the leading House of Lords authority on the meaning of “event” in aggregation language. It is essential reading for any aggregation argument and stands alongside Axa Reinsurance v Field (originating cause) and AIG v Woodman (related matters or transactions) as the three pillars of the modern law.
For brokers, the case is the clearest illustration that the wording chosen really matters. A reinsurance treaty or a primary policy aggregating “per event” will respond differently from one aggregating per “originating cause” when faced with systemic mis-selling, training failures or design defects. A buyer who expects a single deductible across a book of similar claims may be badly disappointed under event wording.
For insurers and reinsurers writing financial lines, professional indemnity and bankers’ blanket bond business, Lloyds TSB provides comfort that event-based language will be construed strictly. It has been applied in the financial services context but its reasoning extends to all event-based aggregation.
The decision also confirms the analytical method: identify the precise aggregation language, locate it within the spectrum from narrow (“event”) to wide (“originating cause”), and construe accordingly. That structured approach has shaped every subsequent first-instance and appellate decision in the field.
By Matt Bartlett, Director, on 2026-06-06. Next review: 2026-12-06.
This entry is part of the Apex Insurance Wiki. Last reviewed by Matt Bartlett on 2026-06-06. Apex Insurance Brokers Limited, FCA FRN 724952, Companies House 07014570. Not regulated advice — consult your broker on your specific position.
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