Paul, Good news about the Bill Nelson. He is underrated by many as you say.

You mention playing Brainbox in the future. Have you considered doing a slot on Bands and their spin offs to see how various band members styles change when they move on? I was thinking (again) of Jethro Tull.......just the original line up as it could get VERY messy otherwise.
You have:
Ian anderson.........Solo albums 'Walk into Light', 'Divinities' and 'The Secret Language of Birds'
Mick Abrahams.......Various albums with Blodwyn Pig and the Mick Abrahams Band.
Glenn Cornick.........3 Albums with Wild Turkey (good to play around thanksgiving) and a couple with Paris (Bob Welch on Guitar.......pretty heavy stuff)
Clive Bunker...........One solo album but numerous guest appearances most notably on Steve Hillage's Live Album.

Is the Focus DVD the one released by 'Masters from the Vaults'? This has live recordings of Hamburger Concerto and Anonymous II on it and seeing those again took me back to some GREAT gigs that used to be put on in London in the Seventies at Sunday Lunchtimes.......They were called 'A Sunday Joint' and bands like Focus, Hawkwind, Phlo and Eddy and Magic Michael would play for hours. Great Days!!!!

Keep it up...great show.