Bank lending practices have come under close scrutiny again, after the Competition and Market Authority launched an inquiry into Britain's biggest high street lenders.

Following two reports, the CMA found that many customers said that they saw little difference between the largest banks in terms of the services they offer.

The CMA's initial findings also showed that some banks were making it difficult for customers to customers to make comparisons between lenders because of limited transparency.

It also said current account overdraft charges were found to be very complex.

However, the CMA stopped short of launching a full-scale market investigation and naming the lenders.

It added though that Britain's 'Big Four' banks - Barclays, HSBC, Lloyds Banking Group and Royal Bank of Scotland - will be helping the regulator with an industry solution.

While all UK banking stocks have dropped on the news, only time will tell over who is in the firing line.