Britain’s Co-operative Bank, which prides itself on ethical investments, has been plunged deeper into crisis after its former chairman was filmed allegedly seeking to buy drugs.

Former Co-op bank chairman Paul Flowers — a church minister — apologised after allegations were published in the in The Mail on Sunday newspaper involving crystal meth, crack cocaine and ketamine.

The paper alleged that the 63-year-old Methodist minister was caught on camera discussing the purchase of illegal substances.

The paper said the event allegedly occurred just days after Flowers had bungled an appearance before lawmakers on parliament’s Treasury Select Committee to explain the lender’s dire finances.

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