Has anybody had experience of B.J. Vallack Engineering of Hemel Hempstead for alloy wheel refurb ?

No, so not much help! But I did nearly use these guys - they seemed quite helpful on the phone but I guess that's no recommendation. (I would have gone to them but managed to get it done through work)

http://www.sweeneysherlock.co.uk/alloy.htm

(Editted to add the link - whoops!)

[Edited on 12/12/02 by geoff shep]