Originally Posted by Styrak
No they are not regulated under the firearms act. Unless you have a pellet gun that fires >500 FPS, but that's it.
There is an energy limit too (5.7joules I think). So an AEG firing 600fps with .2gs wouldn't be a firearm.
Airguns are treated as firearms regardless of power if they are used in a crime.
On a similar note, I just got a Umarex Beretta CX4 gas blowback :P