The Unite union, which represents many Barclays workers, says the bank's decision to cut up to 1,700 jobs is 'a colossal mistake'.
The union said frontline roles, including cashiers, personal bankers, operational specialists, branch managers and assistant managers will go throughout 2014.
It claimed that customer service would be affected by the changes and said Barclays risked damaging its reputation.
In a statement Barclays said fewer of its customers were using branches.
More top news
Western and central regions will be prone to thundery, blustery downpours all day
Police charged student Hayley King with malicious tampering of food after she was also filmed spraying glass cleaner in the fridge.
As the winds strengthen and stronger gusts whip the coasts and hills it will feel cool for the time of year.