I can't fault any of BEagle's advice, it's always worth getting an opinion on PPRUNE while trying to tackle the CAA and getting mixed messages back from them.
I wasn't aware that it wasn't necessary to check my Nav skills but I'm glad I did it since it turned into another valuable learning experience.
At the flying school, there was much discussion over the requirements for lapsed PPL holders for a period more than 5 years... strictly speaking and according to the rules, I could have retaken the RT exams and submitted myself to the wrath of an examiner for the proficiency but after 12 years, I was rustier than a very rusty thing and wanted to go back to basics for my own peace of mind (and safety).
Finally, the examiner used form SRG\1119. I saw this test more as a consolidation of everything I've learned as opposed to an exam. It made it slightly easier having a human examiner with a sense of humour
Thanks again to all on PPRUNE, keep sharing the stories and experiences!