Is it legal to own airsoft guns in the UK (Scotland)?

I would like to buy this airsoft gun http://www.airsoftworld.net/airsoft-guns/airsoft-bb-gun-type/airsoft-bb-gun-rifles/airsoft-bb-gun-ak47-ak74/airsoft-bb-gun-ak47-ak74-two-tone/two-tone-cyma-ak47-spring-rifle.html i dont want to buy it incase the police come and confiscate it or worse, it will probably only be used in my back garden or if i take up airsoft on a weekly basis