Getting back to the original topic. My extensive research in both UK and international regulations relating to air guns shows that most countrys do not care less. The UK Home Office, however, has introduced power limits ( without a FAC) and is discouraging the manufacture/importation of semi automatic air guns even though they are under the power limits. As I understand it there are none available in the UK although they are not illegal.
An update on my dilema: have decided to purchase the "FAC" version of the FX Gladiator with built in moderator. They are VERY expensive but put out 34 ft/lbs in 22 cal. Should be fun