The currency’s gains against dollar and euro is driven a buoyant UK economy and the Bank of England’s caution on cutting interest rates.
“The big picture remains that the UK has performed better than expected, the BoE is easing more gradually than other central banks and we might get an improvement in our relationship with [the] EU.”
https://www.ft.com/content/c8c82e84-4a4f-4cae-8e02-d2cd38e4ef16