The Co-Op bank has put itself up for sale and is inviting buyers to buy all of its shares. The bank almost collapsed in 2013 before being bailed out by a hedge fund. It has been able to strengthen its finances because of low interest rates. The bank has four million customers in the UK and is known for its ethical standpoint. Potential buyers of the bank include TSB, but it’s not clear the amount of capital any buyer needs to sink into the Co-op.