crashes tend to get corrected pretty quickly,
Except in this case it's more like a dead cat bounce.
Sterling, on average, is going to continue to fall.
The FTSE 100 is mostly international megacorps, so now that it's clearer what May will do, it is logically rising, nothing much to do with export of UK services and manufactured products.
There is a short window for people to buy Sterling priced products and then there will be inflation on price of UK exports or web retail sales.