Its the large (42 to 44cm diam) version.
Was about £80 new.
£30 plus post (~£15 as its heavy) or collect Northampton.
I have at least 2 (if not 3) keys for it.
Looks like this one in the photo except a bit bigger (the arm can be folded inside it and then the outer bits closed to save space).
Thatcham approved ("Sold Secure" and all that)
[Edited on 27/2/09 by hobbsy]
Rescued attachment disklok.JPG