Wait, wait, wait.
I looked in LASORS.
Validity - The RTF written examinations and practical
test are valid for a period of 12 months for licence issue.
Where a candidate completes the examinations for a
FRTOL in conjunction with a course of training for a
JAR-FCL private pilot licence, the validity of the
radiotelephony examinations may be extended to 24
months from the date of passing the last PPL
theoretical examination, provided that all examinations
are passed within a 18 month period and that
application for both licences is made concurrently. PPL
holders who subsequently apply for a FRTOL will be
required to meet the 12-month validity requirements.