To us "old school" mechanics who still use Whitworth spanners and sockets, (and measure in Inches) we would use a 5/8" Whit socket for these nuts. 
The wheels were to a War Office spec. hence why the British sizes.
The actual hex size is 27.94mm so not much in it.
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Richard
1943 Bedford QLD lorry - 1941 BSA WM20 m/cycle - 1943 Daimler Scout Car Mk2
Member of MVT, IMPS, MVG of NSW, KVE and AMVCS
KVE President & KVE News Editor
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