Spanish bank Santander has started renaming all 1,045 branches of Abbey and Bradford & Bingley banks.
Santander bought Abbey in 2004 and then bought both the Bradford & Bingley and the Alliance & Leicester (A&L) in 2008.
The nearly 300 A&L branches will be renamed later this year.
The change will make the Santander brand the fifth biggest provider of bank current accounts in the UK, with 25 million savers and borrowers.
The re-naming process, costing £15m, starts with 300 Abbey and Bradford & Bingley branches in the south-east of England and will be followed by the remaining 700 or so later this month.