Hi Robert, and welcome to SBI! and to the forums from another UK person - although I now live mostly in Italy (and the rest of the time in Scotland), I went to university at Durham and Newcastle was my go-to shopping place - love it!
There's an SBI! London group which meets once a quarter which you might find helpful. They have a thread on the forums, here
, and a Facebook group to arrange dates etc. - the next one is in April.
Getting stuck into the Action Guide is definitely the best place to start, and using the forums to ask for help or advice if you get stuck is the next most important thing.
Good luck with your journey - you'll enjoy it!