Each place charges their own rates.

Don't think there is a rolling road in or around Peterborough anymore other than Jabbasport near Crowland who are VAG specialists.

http://www.jabbasport.com/

Not too far away are Corten Miller on way to Skegness, they have Dyno Dynamics rollers

http://www.corten-miller.co.uk/

£48 inc vat for power run.

http://www.corten-miller.co.uk/Rolling-Road/