The TM looks nice and straight, yes it's the GPMG mount on the roof, they appear sometimes on milweb. The "singing" clutch, after changing the release bearing three time and getting Borg and Beck technical involved it's the nature of the double clutch plate, most TMs clutches sound as if the release bearing is dry this is normal don't worry. I probably will not be at the Hop farm (to much hassle).
I will try a couple of contacts for a copy of the manual. The tyre blowout, the pressures were correct and the tyre speed limit of 50mph was not exceeded, it could have been a tyre fault or a piece of debris in the road we will never know!
Thats my rambelling finished.