I've had a few cylinders re-plated by langcourt in Weston Super-Mare over the years (not NSR) http://www.langcourt.com/index.htm and they have always been a good job. Not sure it's any cheaper going direct than it is going via BDK or Stan or whoever though as they doubtless negotiate trade discount with the plater. Not sure if BDK or Stan use Langcourt or the other big UK plating place, the name of which escapes me just now
Cheers
Wb