[boxhead]

Hi Pat, the radiator is new, but I will pull it out and see if I can get the flow checked.
RustyBob, the fans are working correctly and are blowing in teh correct direction.
Rob, If it was a fan issue, as Pat says it would not happen when drivin(as road speed would give air flow better than any fans).
I will also check for anything blocking the airflow, and just last night realised that I have not refitted one of teh undervehicle (under engine bay) shields, so this might be having an effect on air flow and air direction.

Thanks for the ideas and tips, please keep them flowing and I will let everyone know what I eventually find.