I thank you all who have responded to my question, particularly to Macafee2 and Kelvo. The wrench from Machinemart looks just right, and the one from Liftmaster via Amazon looks identical, with the further benefit of a case. Both are UK vendors and the price difference is negligible so I will go down that route.
As an aside, I always check I can undo a couple of nuts with the hand brace before leaving the tyre depot, expecting them all to be torqued to the same value. I do the same after service. That one must have been done twice, or before the gun was adjusted.
Derek.
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