Depends on what kind of value you are looking for, for training wise etc its a good move but more importantly CC can be a lonely business when you are on your own, sometimes you have no one to turn to, simply being or at least feeling that you are member of a club or network can have a huge beneficial effect even just receiving the much lampooned Newsletter helps keeping you in touch, no doubt many more experienced CC use newsletters in their own business's ,
Many moons ago I used to be a member and a strong one at that, I just felt they got left behind , caught in a bit of a time warp especially when everything went on line (yes that long ago) and need to catch up fast.
How much is it £300 ? £25 per month, it's peanuts isn't it ............I really don't know much if anything at all about the NCCA these days but it does seem a trivial amount to be part of a national network.