Chair of the Public Accounts Committee Margaret Hodge said the Equitable Life compensation scheme has "let down a lot of people".
Ms Hodge said there was over 200,000 people who could miss out on compensation as a result of system failures.
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Sir Bruce Forsyth, Sir Cliff Richard and the Prime Minister have been among those paying tribute to Cilla Black following news of her death.
TV favourite Cilla Black, who has died aged 72, gave viewers a "lorra, lorra laughs" during her long career.