Seems the front end of Edward's starboard-side chassis is falling off, taking with it the front spring hanger - cracked right through just aft of the spring hanger... at least that explains the clonk on braking. Doesn't seem to have any obvious effect on handling, mind. The port-side one looks like new.
So that rather means he's not coming to play - I've not got time to both mend it and get him tested. I'll bring the Ford instead, but I don't anticipate off-roading it.
Richard - you got a price on a driver's side chassis front end repair section, early series III chassis, including spring hanger?