The FTSE 250, the index made up of companies heavily reliant on the state of the UK economy, is within touching distance of erasing its steep losses suffered in the wake of Britain's shock decision to leave the EU.
Britain's economy expanded at a good pace in the three months leading up to the EU referendum, according to data on Wednesday.
The Federal Reserve held open the prospect of a second increase in interest rates later this year as it said that near-term risks to the US economy had diminished and the job market recovery had regained momentum.
A legally-binding contract committing UK consumers to subsidise Britain's first new nuclear plant in a generation is expected to be signed on Friday, after the board of EDF meets to approve the �18bn project on Thursday.
File photo dated 22/08/13 of Taylor Wimpey signs at a housing development, as the housebuilder said it is business as usual after it boosted profits and shrugged off uncertainty surrounding Britain's referendum on the EU.