The pound has hit its highest level against the dollar since the Brexit vote after a senior Bank of England official fuelled speculation it could raise rates in the coming months.
Gertjan Vlieghe, who has previously argued against a rate rise, said the moment is approaching.
The Bank kept rates at 0.25% this week, but hinted at a rise in future.
Sterling rose more than 1% against the dollar to hit $1.3610.
That was its highest level since 24 June, the day after the Brexit vote.