They changed from the single licence to individual licences a about 3 years ago. We all hold individual certificates.
The certificate granted for the purpose of section 1(1) of the Firearms Act 1968 to the holder and relates to the firearms and ammunition specified..The Pistol is held by a named Certificate holder and the individual certificate allows you to borrow said pistol from time to time. The certificate also licences and restricts the amount of ammunition you may hold at any one time.
So it does not enable you to buy or use a shotgun or other firearm away from your place of work. You would have to ask for a variation to enable this.