After somebody stole the hitch pin back at easter time and was probably trying to steal the tow bar attachment as well I bought one of those lockable ones. It is made to suit a variety of sized towbars and uses a pin to stop it from rattling on the the smaller sizes. Seems someone was going to have a another go - the anti rattle pin is missing but guess these low life hadn't seen a lockable hitch pin before so I still have my towbar. Getting too bloody common.
sam