AlphaTauri has the biggest upgrade at the British Grand Prix but there are significant developments from both Mercedes and McLaren at Silverstone. The AlphaTauri update is extensive, with a new floor — highlighted by specific changes to the floor body, floor fences and floor edge — as well as diffuser, engine cover bodywork, rear suspension, rear wing and beam wing developments. Close behind in terms of number of upgrades is Alfa Romeo, with five areas — the floor body, floor fences, diffuser, rear corner and rear suspension — having been adapted in order to improve the aerodynamic flow of the…