Thanks Wally,
Re. Oxford, I thought I should ask, I did find some reports at Bovington, but always interested in learning more. I can see your predicament, a friend whose father recently passed away is now having to sort out his collection, no mean task as I can vouch.
Not seen that Unipower 4 tonner before, it would have been an awkward one to climb in and out of I reckon.
regards, Richard