Barclays Bank plc are a Wunch of Bankers, as are any other bank who don't employ enough people to answer the phone and instead leave you waiting a long time for your call to be answered while they give your money to someone else.

phone: why don’t you go to sleep tommy it’s 2 in the morning?
tommy:why don’t you die you dumbazz

Person 1: Do you know what is the collective noun for a group of bankers?
Person 2: No idea.
Person 1: A Wunch of Bankers!
Person 2: What... oh, I see, a bunch of wankers!