whats a well known decent roling road,no further down from scotland than say manchester/liverpool?????

me and couple of mates are real curious to see what our cars will make on diffrent rollers as a guy i know at work has a print out saying his 4x4 saph made 406bhp on greens.t35 on standard bottom end and head....and honestly dont believe it to be realistic............

so we are thinkin of going somewhere for a weekend away and cut this in and compare graphs...............................