To offer some realistic advice here. And introduce myself - I am B2/B1 + C with quite a few types - I served for 22+ yrs and have been out for 9+ yrs so I am getting to be an old duffer. The following is based on my experiences, and things may have changed now ; and they may change further by the time you get licenced
Yes, there is currently a reduction in time (from 5 yrs to 1 yrs) for appropriately experienced engineers to apply for the basic CAA Pt66 licence, but please dont think there is an opportunity to fast track yourself to becoming an LAE; it won't work! You will have served for 5 years (minimum) in an RAF aircraft maintenance environment.
Logbook - as long as you provide some suitable experience format (the CAP 741 is ok). As mentioned its going to be a good idea to have your log book in ATA chapt order (where possible) indicating the aircraft type and reg no, detailing the type of jobs for traceability. Show a good breadth and mix of scheduled and unscheduled tasks , fault fading, LRU changes etc plus the appropriate recovery procedure . Get the basic skills signed off. Your RAF aircraft experience, whilst important, is in my view, 'less' important than your (minimum 1 years) civilian experience in a Pt145 environment, following all the approved procedures and certified by B1/B2 type holders and then signed off by the quality dept, so don't sweat the RAF experience too much.
You used to be able to get your SEngO to sign these docs/log book entries off.
When you leave the RAF you (used to) get your quals and auth on a JPA print out this can also be used to provide extra proof of experience formally - the CAA like that.
The Pt 66 modules have a life (10 years) there are quite a lot to complete 12 + and you will have to get your licence in this 10 years, otherwise the modules expire. So theres a question of timing which you will need to manage. The licence modules are nt too difficult but don't take them for granted, you will have to get plenty of revision in or the possibility of failing the module increases and you then have to wait a few months before the resit (there are exceptions for the 147 providers).
Its good that you're thinking ahead for your future career, but its not a race, and the RAF can have different ideas which can make your life-plan tricky (ie post you somewhere off aircraft). So concentrate on your job in hand now, get your head down, learn all there is to know about the maintenance of aircraft, then in your last 2 years start studying your licences (don't boast about becoming an LAE and think you can avoid the less glamorous jobs at 3am on the ramp whilst you're in the RAF) so tread carefully, and good luck with your choices