From the CAA
website
Skilled Workers, Armed Forces, Non-EU Applicants
What credits can ex-military aircraft engineers get towards obtaining the Part-66 licence?
There are currently
no credits available towards the Part-66 module exams. However, authenticated engineering experience on operational aircraft will be counted towards the overall experience requirement. A minimum of 1 years experience is required on civil operating aircraft relevant to the category or sub-category of licence you are applying for.