Nigel

First off good band and song/video. But your story is all too common. Booze, drugs, egos, and palin stupidity sink many bands. When it right its great but its a hard mark to hit and attain.

Bridge
Never quit a band untif a few years ago. A year of rehersals to find out they never really wanted to play any gigs !!
Fired three times. First was because I refused to pull my B3/leslie multi -keyboard setup out of the restaurant we were playing 4 nights a week for a Sunday afternoon rehersal in a school gym with a Tower of Power clone band. Second becaue I didn't want to move up to playing six nights a week ( I was just starting my teaching career ) and third because I clashed with the guitar player ( supposed leader of a new band ) who refused to play anyting but 3 chord Blues.
I all worked out for the best and will for you too so just move on.