Barclays is to cut up to 1,200 jobs as part of a two-year shake-up plan that will also see the Woolwich name disappear from the High Street.
Woolwich has recently been advertising on television
The job cuts will come through the closure of three call centres in Bexleyheath in Kent, Clacton in Essex, and Dudley in the West Midlands.
While most Woolwich branches will be rebranded Barclays, those within 300 metres of each other will be merged.
Barclays said there should be no job losses as a result of branch closures.
It added that 10% of its combined branch network would be affected.
While the Woolwich name is to disappear from branch fronts, Barclays said it would continue as the brand for its mortgage products.
Woolwich was bought by Barclays in 2000. The name will disappear from branches starting next February.
Barclays, the UK's third largest bank, said it hoped to avoid forced redundancies at the three call centres.
"With careful management of staff turnover and active steps to redeploy it is expected that the number of employees made redundant will be significantly fewer than this," it said.