The 401 was much roomier than the 400, yet its body weighed only 120 lb more. It brought Bristol's first purpose-designed heating system and an unusual set of conveniences: pull-knobs inside the car released the bonnet, boot and fuel filler flap, a push-button released the spare wheel, and press-button door locks made the car so secure that, Tony Crook recalled, one buyer locked himself out in the middle of a demonstration.
Pomeroy, writing in 1950, rated the 401's combination of virtues unequalled in any car in the world: four seats, a very large luggage capacity and the ability to cruise fast for hours. Owners abroad put that to the test. Jack Lawson drove a left-hand-drive 401 across Canada in 1951 and took the same car over Peru's Ticlio Pass, at 15,895 ft, in 1954. In Australia the Sydney architect Donald Maclurcan drove his 401 some 3,000 miles a month on the Snowy Mountains hydro-electric project and kept up a long technical correspondence with Filton, which thanked him for helping other owners.