It's not debatable. If it is under 500fps, it is not a firearm requiring a PAL to purchase. If you use it to commit a crime, however - you will be tried as if it was a firearms offense.
A good accurate air pistol, I'd recommend the walther PPQ, or CP Sport. Both reasonably cheap, and very fun to shoot. Quite accurate too, for an air pistol.
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Currently own:
Mossberg 464 .30-30
Mossberg 715T AR .22lr with M203 40mm
1952 Soviet SKS Carbine 7.62x39mm
1957 Soviet TOZ-17 .22lr
1942 Soviet Mosin Nagant 91/30 7.62x54R
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