Murray - you do have a copy of the DD 2006 rules too mate?
Cos the ACU book wont tell you tyre types for the DSC DD series.
The main time the ACU book is used, is for construction regs, if there is a conflict between DD & ACU rules - then ACU takes precedence (so sayeth the 06 DD rules, as they also did last year)
C
ps: Dom - you need Dunlops mate:P