Thanks very much for the wiring diagram, it will be very handy.
My Beaver is a Mk2 and I purchased it about 5 years ago from Steve Carter, put the engine in had the injector pump seal fixed and got it running. Then fixed the brakes and have been using it eversince. Also have another chassis with axles for spares.
When I get it out next time I will take some pics. I was very lucky to get a set of extension tynes and the correct hook plus some of the mudguards. I think there is another set of extension tynes locally that may be available if anyone is interested.