The Tufftrax was my first ever mountain bike, bought for somewhere near £300 from the bike shop in Tooley Street, London Bridge. Mine was pale yellow and had a chain stay mounted U-Brake, I think, I recall it still having that cable hanger though on the seat stays. I bought it either in 1988 or 1990.
It was stolen once when I was at Uni, and I bought it back off a "man in a pub" for £50 as he said he had "previous" and just wanted to do the right thing....for £50! Eventually it was stolen for good in 1994 again from Uni.
In between thsoe thefts it was also taken by a fellow student in a tit-for-tat pranking spree and a week later I received in back completely disassembled with all parts in a box. I got him back as I moved his entire desk, chairs and drawing board set-up onto the roof of our design studio.