Jo Crowley MADRID/LONDON (Reuters) -Santander's plan to buy TSB for 2.65 billion pounds ($3.61 billion) and boost its position in the UK came together just a few weeks ago, after the Spanish bank had been weighing a possible exit from Britain,

The TSB name could disappear from UK High Streets after the British bank's Spanish owner announced its sale to rival Santander. The £2.65bn deal still has to be agreed by the current owner Sabadell's shareholders but if it does go ahead,

The Spanish lender is about to become the third-largest bank in the UK by share of personal current accounts, after the deal is closed.