Have you contacted the UK distributor?
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Curiosity got the better of me.
Ordred a Ribble HT 725 hanger, its the same as the On One hanger. Was £22.99 posted.
Worth trying a ribble HT 725 hanger? Link
Dropouts etc on the frame look like they come from the same supplier.
Later 1×1’s lost the V mounts. Link
Got a pair on the way from Germany, new <£150 posted on eBay.
Also going on a Big Dog when that arrives.
Spares not as easy to come by as suggested. Cant find a 130mm spring as yet, so might end up running it at 140mm for a while.
Have an old stock from an 1813 (ex club rifle).
At Bisley this weekend, will be in the north west next weekend.
Email if interested.