From LASORS Section A Appendix B:
The system that was decided upon was the
taxi-assessment system. The Service pilot adds a
taxi-time allowance (see table 1 below) to each sector
flown as entered in his Service logbook - the taxi-time
allowance being dependant on the type of sortie flown by
the pilot. The taxi-time allowances built up throughout a
career are then entered into a table (see table 2 below)
to arrive at a total for their career. Prior to leaving the
Services this table should be placed in the pilot’s logbook
and signed by his last Squadron Commander. Please
note that this arrangement cannot be used for CAA
licence issue purposes.
It should be emphasised that when canvassed, most UK
airlines said they were aware of the discrepancy between
the Service and CAA method of recording flying hours,
and took this into account in the recruitment process.
Where this is the case, any hours calculated by the
individual Service pilot in excess of 75 hours should be
taken into account by the individual airline.