@StephB Our service sites only offer repairs and similar services. To deep clean your Dyson, please go to the support site and enter your Dyson’s serial number there - you will find instructional guide videos to clean every accessible part of your vacuum there.

Dyson don’t offer a cleaning/MOT of their machines, even at cost. I’d suggest searching online for a local service centre, none Dyson affiliated. They usually clean/replace filters as part of a package. 

Dyson only offer a out and out repair - Support | Book a repair | Dyson. They’ll only replace parts that are faulty/broken, it generally doesn’t cover a deep cleaned and spruced up. A local handy-man or vacuum centre might.

If you didn’t want to pay out, here are some useful cleaning tips: Keeping your vacuum performing at its best | Dyson Community.