Yes,
Grandpaul got it spot on and I've now found the bracket in the parts catalogue in the 'Battery, Toolkit and air Filter section'. Not going to be a show piece so it's not getting fitted (unless I find the top bracket).
When I got the bike which had been stored in parts in a roof for 12 years, everything had been liberally sprayed with 'wax oil' (with which I would not recommended).
The swinging arm was seized solid in the frame, so bought a piece of brass bar and turned it down to suit and with the aid a FE hammer coaxed it out, cleaned it up, put the swinging arm spindle in the lathe, cleaned up a slight burr that was causing the seizure, refitted the spindle and applied plenty of grease - perfect.
After rebuilding the forks etc, I now have a rolling chassis - result.
The engine strip went well and somehow I managed to get away with just dressing the crank journals with very fine wet and dry. Barrels are off for a re-bore +020" and pistons are on order.
Apart from cleaning everything of wax oil, road dirt and muck, the hardest part so far has been removing the crank sludge trap. Ended up drilling a series of hole in the trap cap and knocked a old square shafted screw driver into it and with the aid of a series of spanners to give leverage the trap came free to reveal a solid block of sludge which I had to partially drill out. New trap fitted along with a hex headed trap cap.
Looking forward to the engine rebuild.
PS This is a slow time job as it's a retirement project that I'm plodding along with when the mood takes me.
Photos of the frame with seized s/arm.
and sludge trap contents.