I can remember travelling in the era of 70 mph National Express, using leyland's, Plaxton and Vanhool etc, can remember the first Plaxton Express Liner's, no back window, and the next model of same name, and the Leyland's High liner's and Low liner's, and Vanhool and Duple from brand new, can remember some 80 mph plus off the clock runs when governor not working, on Van hool single deckers and Plaxton's, most speed probably done is 85-90 mph on over night on the Gatwick-London-Birmingham etc service, and London-Newcastle during day on M reg Vanhool single decker which due to blowing up gear box or clutch had governor taken out, made up 45 mins approx between Golders Green and Leeds, hitting the drivers said about 85 mph on M1 about mid day, another time was racing lorry in Plaxton, downhill at 80 mph plus , was certainly more fun in those days and a lot quicker.
Did London-Paignton,London Aberdeen,London-Glasgow, Birmingham-Glasgow, Glasgow-Gatwick over night, Birmingham-Gatwick, and many other routes, can remember the Norfolk flyer with National express, run by Ambassador Travel, on Leyland's and MCW double deckers London-Newmarket, and seeing the Scottish City link Cordon Bleu if spelt correctly, Armstrong Galley, plus others.