Get yourself out to some sessions Ross -- it's good practice, great craic and you meet other musicians and eventually you get together and form a band. It worked for me! The South Midlands Session Guide is a starting point, but only as a guide. It looks a bit out of date, so check first. Certainly the Fox & Hounds, Stony Stratford listing is wrong -- that's now on the first Tuesday each month. I can personally recommend that one (well I would do, I run it), and the Sunday lunchtime Vaults session. Check out The Bull at Barton Le Clay on alternate Mondays (21st is next). I think the Cannon at Newport Pagnell is up and running again on Wednesdays, and I'm sure there are loads more, where you'll find all kinds of music being played.
So get out there and find other people to play with --- it's better than staying at home and playing with yourself!

BJ