Ed,
The main difference between affiliated and associated is that if your club is associated, you get to make a value choice as to whether to join the AWGB or not.
With an affiliated club, you don't have that choice.
My club is associated but we promote AWGB membership and indeed some of our members have retained their membership and new members have joined the AWGB.
You need to weigh up the benefits to you and use that to decide which club to go towards. Either way, do go along to a club, they are a mine of information, good demonstrations, good company and lots of woodturning talk. If you're in the Surrey area, you would be most welcome at our club.
David
David