If the adage that rules stability in Formula 1 tightens the field holds true in 2020, then the midfield battle should be one to savour. McLaren headed the best of the rest pack more often than not in 2019, but it still faced stiff competition - so can it keep that form up, or will it be knocked off its perch? Autosport examines the midfield contenders’ new challengers - or those that have released images of their cars, at least - and the design tweaks from last year to this, to gauge who’s in good shape ahead of the start of pre-season testing at Barcelona.