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Finally found the hub you were referring to. I got the old freewheel off the stock wheels and took the opportunity to properly measure the OLD. The dropouts seem to be 135, but the hub is 140 (ish). How odd... This may make it difficult to go with my plan of adding spacers to allow an 8spd freewheel.
A new wheel is definitely in the works, but still undecided about getting a hub for a thread on drum brake or getting a disc hub like you did (for that sweet future tandem that is definitely going to happen...). Definite bonus point for the disc hub as it has 4 bearings (two in the shell and two in the freehub body) whereas the threaded hubs have only two.
Mine is, unhelpfully, 135. 140 is more standard for tandems though. And haven't looked at tandems.co.uk but the hubs were labelled as orbit if that helps.