(1) These Rules shall apply in the case of a person who—
(a) retires or, subject to the next following paragraph, has retired from service as a regular fireman in a fire brigade in Great Britain without being entitled to a pension under the Firemen's Pension Scheme;
(b) within 12 months of so retiring (or such longer period as may be agreed in a particular case by the fire authority and the Corporation), without any intervening service as a regular fireman, becomes or has become a member of the Belfast Fire Force, and
(c) within 3 months of becoming a member of the Belfast Fire Force or, within 6 months of the coming into operation of these Rules (whichever period last expires), (or within such longer period as may be agreed in a particular case by the fire authority and the Corporation) notifies the Corporation that he desires these Rules to apply to him.
(2) These Rules shall only apply to a regular fireman who retired before the coming into operation thereof if the fire authority and the Corporation in a particular case so agree.