Dunlop bits
The first port of call for information was Dunlop, the second was the RAF Museum. Both drew a blank sadly.
OK, a few other numbers:
AHO35387 – brake bag
AHO89474 – brake lining
AHO17411, 27G/4619 – brake bag
27G/4675 – brake bag
and a brake relay valve, Mk III, 27G/2585. Part number appears to be AC12734.
As always, any help much appreciated!
George