T5r 1996 - need to check mapping

My 1995/96 T5r lives again
New head replaced and all good - well almost.
The engine had been remapped a few years ago but this company no longer exists and I seem to have a smooth power feed ( lack of) it hiccups around 40-50 on acceleration then carries on. Garage has checked basics but as remapped they do'nt have the numbers so I need to get it checked on a rolling road. Anybody recommend someone in hampshire/surrey/berkshire area (I am in camberley)
Any advice welcomed
Mike

Your map won't alter no matter who loaded it.

Did it do it before you had the head done?