At long last! The final bogie gave up and came off the rear x-tube this afternoon, the two x-tubes were checked for fit on the chassis but now need heating and a couple of dents taken out to give a good fit, the RHS front x-tube needs a new bracket making at the same time. After that they can both go for blasting.
In theory the brackets should allow the x-tubes to move side to side and then be held in their ideal position with a pinch bolt, in my case there is so much corrosion between the brackets and the tubes that freeing them off could well destroy them. As such I am hoping that everything lines up in its corroded position!