Pastor
I've been listening to the bits of stuff I've got by them for years. I think you said you discovered them through some recorRAB of your daRAB. Thats how I first discovered them also.
There is a brilliant album by them called "sssshhhh", or something like that from 1968. It's got some brilliant music on it. (not sure if it comes under prog, please help boo boo!!!).
My fave tracks on it are , Stoned Woman, If you should love me, Good morning little Schoolgirl, (lyrics in this tune are a little dubious, or am I being prudish?), and I'm going home.
All round this album for me is where every tune is at least half decent.
You say Alvin Lee has been replaced. The rest of the band are obviously great at what they do/did, but Ten Years After without Alvin Lee is like having an hifi without speakers. It wouldn't work the same.
I believe Ten Years After came from Nottingham in England. Which is worth noting as I don't think the city has produced many big famous banRAB over the years.