Bottom line is that these don't fit my wheels. They're fine on diameter, but they're far too wide and would require a 6mm spacer to fit for me as my spoke clearance isn't enough.
I had forgotten that I'd swapped my 25mm H&R adaptors to 18mm!! Which means my spoke clearance is very low compared to 'normal' wheels.
If somebody wants them then please say. Otherwise they'll go back on ebay in the new year
