The FTSE 100 moved higher on Friday as markets showed signs of stabilising after a volatile week, but the UK benchmark remained on course for a weekly decline of around 2% following four consecutive losing sessions. JD Wetherspoon shares climbed more than 8% in the FTSE 250 after the pub operator reported revenue slightly ahead of forecasts, despite full-year profit falling by more than analysts expected. IG Group was the FTSE 100’s weakest performer, plunging more than 20% after warning that annual revenue growth would reach only the mid-single-digit range, citing less favourable market conditions. The update also weighed on the online trading sector, with CMC Markets and Plus500 both falling more than 7%.