By Jess Jones Food delivery company Just Eat has posted a drop in sales as order numbers fell across all regions, but has reiterated its full year guidance. In a third quarter trading update, the London-listed company revealed its total gross transaction value (GTV) fell three per cent to €6.34bn (£5.3bn), down from 6.53bn (£5.46bn) in the year-ago period. Excluding North America, where GTV fell 11 per cent, total GTV grew two per cent. Across its Southern Europe and Australia division, GTV plunged 12 per cent. However, Just Eat reported “continued momentum” in its northern Europe and UK and I…