Thanks for the suggestions chaps, I decided to try a Flambau oversized single gun case from Uttings £39.99, saw a couple of good reviews on youtube plus some positive written reviews on the net. I'll post back my findings once I've tried it out, arriving Tuesday.
BSA GRT Lightning XL SE .177 fitted with Hawke Vantage 3-9×40 Scope
AA S400f Classic .177 fitted with Hawke Vantage SF 3-12×50 Scope/Q-Tec Silencer/Rowan Magazine
Webley Tempest Pistol .22