HA down here are pretty quiet (there club house is about a mile down the road from me). Almost too quiet - they were by some accounts told to be a bit more "visible" a few years ago. Nice enough bunch of people when the mood takes them, but again, I've no intention of pissing them off.
There seems to be a hierarchy of clubs - from MCC (side patch and front patch) to side and front patch MC - to full blown back patch to the HA at the top of the pile. AFAIK most HA members work there way up through the clubs, hence most of the HA tend be closer to bus passes than free school milk.
To be quite honest, I can see the whole patch club scene being gone in twenty or thirty years - most new bikers who join a club head towards one of the owners clubs rather than the traditional MCC, and I get an increasing sense of irritation with the whole strutting "respect my patch" attitude. In a way its sad to see the whole club scene slowly dying away - theres very little new blood coming in, even though the clubs try not be elitest. Most of the ones I know would be more than happy to welcome spotty herberts on ratty 125s.
As to other back patch clubs, the National Chopper Club are still going strong (and still building custom bikes), Ogri MCC are still Ogri MCC and still the great bunch of larger than life lunatics the've also been (They won Scrapheap challenge a couple of years ago), the Christian Motorcycle Clubs (who look like Hells Angels, come of it a lot of them used to be HA) look scary enough, and have god on thier side. Still a bunch of pissheads
.
As to the Windsor HA story, IIRC it ended up with a shooting down the New Forest around 1980 ish? The last HA scrap I heard of was the '96 Rockers Reuinion stabbing (I was a MAG rep through the fall-out from _that_ particular episode).
Andy