Salty you should be asking if the TA will allow you to become a Ff check out the QR's.
Employment during Leave or Off Duty Hours. J5.078.
g. Permission must not be given for individuals to undertake employment, whether temporary or part
time, in any of the following fields:
(1) As a retained fireman.
(2) As a member of any constabulary including MOD and Railway Police.
(3) As a security guard in any form (this includes acting as `bouncers' in night-clubs, discotheques
or public houses).
(4) As an insurance agent, or any form of financial agent, except that, with the prior permission of
the commanding officer, Service personnel may accept the position of agent where this
acceptance does not involve selling insurance or giving advice on insurance or financial matters,
but is intended solely to satisfy a professional requirement to enable them during the ensuing 2
years to take up employment in this field on leaving the Service.
This may only apply to Regulars but its worth checking it out.