This guidance applies only if you have a case involving foreign service (see EIM13680) and it includes service before 6 April 1974.
The rules were different before 6 April 1974. This may affect
the calculation of full exemption (see
EIM13690) and will affect the
calculation of a reduction (see
EIM13700).
In testing whether
full exemption is due under
EIM13690 this difference is now likely
to matter only for the first and last tests of exemption bulleted
there (namely, where 3/4 of the whole period of service is needed
to be foreign service, or where 1/2 of the whole period including
10 of the last 20 years is needed). So:
In testing whether
reduction of charge is due under
EIM13700,
any service before 6 April 1974 will affect the
calculation. See SE13710 (last paragraph) to find out whether the
service of that period counts as foreign service. Then finish the
calculation required by
EIM13700.