Reserve roles exist in specific reserve squadrons, which in turn are located at specific RAF bases. As you will not be resident at those bases (except on multi-day operations or exercises), geographic proximity to where you live is important. These are the bases where this role is active:
502 Sqn, JHFS Aldergrove, Co Antrim
603 Sqn, Edinburgh, Edinburgh
605 Sqn, RAF Cosford, Shropshire
609 Sqn, RAF Leeming, North Yorkshire
2503 Sqn, RAF Waddington, Lincolnshire
2620 Sqn, RAF Marham, Norfolk
2622 Sqn (Highland), RAF Lossiemouth, Moray
2623 Sqn, RAF Honington, Suffolk
2624 Sqn, RAF Brize Norton, Oxfordshire
3 Police Sqn, RAF Honington, Suffolk