I think you've cracked it Chris. Even an old 2.3 diesel will manage more than 35mph (a little ).
My old S3 2.3 diesel would do 55 flat out and cruise at 50 - once I had fitted new pistons, rings and big ends. I once saw 58 down hill. Ear defenders might have been a good idea though.
Paul Costock, UK Plus Four 75th - Furka Rouge - Pip Disco 5 Teddy - 17h1 Irish Draught cross
). 