Having served all that time in the forces (thank you very much for that) I’m assuming you passed your car test before 1997. If that is the case you will already hold a C1 (7.5 tonne) licence. This in turn will give you acquired rights for driver cpc until Sept 2014. If my assumptions are correct, then the answer to your question is NO you don’t need your driver cpc at any point just yet. You will need to complete 35 hours of periodic training before Sept 2014 in order to continue driving over 3.5 tonnes professionally.
I strongly suggest you locate a good trainer who will be able to give you accurate advice at each stage. In the meantime there are several reliable contributors to this forum who will try to help. But it’s always easier face to face.
Information for how to start the process can be found on the websites of most good trainers. Beware the brokers who will invariably charge more and often provide poor service. Speak with the provider that catches your eye and arrange to visit the centre if possible. Then make a decision before parting with your hard-earned.
All the very best with it all. Feel free to pm if I can be of further help.
Just left the RN myself after 23 yrs and moving into driving is a goos decision as far as im concerened. There is some fantastic advice on here.
Where abouts are you going to do your training?
Is the army paying for this as part of resettlement
Depends where you are but look for a good trainer go & visit them have a chat see what they are about sit in 1 of the vehicles before you book any of it
You could always give Peter Smyth a call ( I did he gave me a lot of good advice but due to other factors he is a bit far for me but then most of the trainers will do that for you )
Pete has given some sound advice in his post, as he said beware of brokers, there are plenty of good trainers on here who will willingly give advice and point you where you need to be.