The model 99 is not easy to find even here in the US. If one is really wanted, I would suggest contacting a shop in the US, like MAC-1, who also sells vintage airguns on the side. It still might take some time for a good one to show up. One nice advantage of working with a shop like MAC-1 is that they could service it prior to sending off. Of course, I have no idea on current UK import rules and no info on hand about factory stated power output of Model 99.