If the barrel is smothbore, so it counts as a shotgun, it can be 'lent' for up to 72 hours before going on a certificate. If the barrel is rifled, no , it should if taken out be in the control of the licence holder, WHO must have the licence ON THIER PERSON. The main thing Police are concerned with in cases like this are the firing mechanisms. That has to be in a secure cabinet . Bit difficult getting a Firearms Cabinet big enough for a Scorpion. :-D
To get a Section 1 Firearms now takes about 18 months. You have to be a memebr of an approved club for minmum one year, and shoot regulary. Being Trumpton, try the Civil Service Sports & Social Club. they have attached clubs, and subsidised mebership