Had the template made up by http://lasermaster.co.uk/ - in 2 mm steel with 2mm holes. What a fantastic service ! £7 inc VAT,material and postage. 2 day turnaround. Just send them the dxf or standard stuff is on their website for direct order.
That would have been nice, unfortunately AFAIK there aren't any that size.
Anyway, wheel drilling worked perfectly with the template. Almost finished the IRS conversion so going to mount and tack up outer plate to wheel with the 14mm holes (not the easiest to fit on the studs with a 25kg wheel!) then bore out to 16mm (so they mount easier) and 60deg countersink to match the 60 deg cone wheel nuts I bought. Post some pics when done.
So this worked out really well, The 5mm plate was welded on from the back through the old bolt holes, then filled and smoothed. new holes were countersunk and drilled out to 16mm. Now much easier to mount and hub-centric.