See CAP 804 Section 4 Part D, Subpart 2 Page 2.
You will have to pass
all the exams
and pass the CPL(H) Skill Test, I regret to have to tell you, irrespective of your years of military RW flying....
Part O merely allows entry into the EASA system. Unlike the previous system, it does not recognise the 'Experienced QSP', so will be very unlikely to act as a recruiting or retention incentive. No longer will people bite the bullet to reach the old 2000 hr TT mark, if they have any aspirations for a second career, because there is no incentive to do so in licensing terms. Whether that will lead to erosion of experience in front-line squadrons will doubtless be a matter for MoD to consider.
But if, as a PPL Examiner, you bowled up to CFS do your A2 and the CFS A1 trapper didn't hold even a PPL, you could perhaps offer to let him/her take the PPL exams 'under the auspices' of your flying club......
