Yes, welcome to the BAA. As Jeremy says the VSS are a very active section and they will be able to provide a lot of help and guidance with regard to variable star observing. There are lots of other sections too so have a browse around the site to see what you are interested in. Also, since you are in Walton access to London is fairly easy so come along to one of our main meetings if you can. We also have a meeting next weekend in Milton Keynes which is themed around stars. If you do make it to a meeting search me out and say hello.
Nick.