Finding tyres to fit British wheels is not easy and various suppliers are doing their best to offer suitable tyres to owners of vehicles with these wheels.
ToTec Tyres in the UK - see
http://www.totectyres.co.uk/military.aspx - was kind enough to supply a tyre to a MLU member for a test fitting. It turned out it had same bead diameter as the standard US rim, i.e. 15 3/4" rather than the wartime British size of 16". As with most 9.00-16 tyres manufactured for US wheels, it needed to have a small bit shaved off the bead to be able to fit it to a WD split rim.
No connection with the company, but as they went through the trouble of having a tyre test fitted, I think they are worthy of a mention here!
Hanno