Hello Martin,
My best suggestion would be to get in touch with the Welsh Airgun Association. I'm sure that they will have someone close to you who will have their own pistols for you to try. They can be found with an internet search for 'welsh airgun association'.Surrey Guns are great, Peter Friend always carries a varied stock of target pistols.
I would suggest that you are limited to a choice of three pistols, either the FWB P44, Steyr LP10, or Morini CM162ei. Any of these pistols will take you as far as your ability will.
Harry Preston (Steyr UK) is based in York, and carries a stock of Steyr air pistols. Iqbal Ubhi is the Morini agent, he lives in Birmingham and will let you try a Morini. I don't know who imports and services FWB.
If you have any problems reaching anyone I have mentioned then PM me, I have all of their numbers.
Regards,
Fierynick
+Keep Calm and Shoot Tens+