I just wandered into town at lunchtime and picked up a Rainbow DVD from MVC for £1.99.
It covered Rainbow from when Dio left, ie. with Graham Bonnet, Joe Lynn Turner, and then back after a break with Purple, with Doogie White on vocals.
It has comments from Neil Murray (bass player in Whitesnake, National Health, and Sabbath) and members of Forever Autumn (who supported Blackmore's Night when I saw them in Reading a couple of years ago).
I watched it from beginning to end.
God, though, Joe-Lynn Turner was absolute crap! I realised that I never even listened to two of the albums he was on with Rainbow, nor Purple neither!
(I guess there must be some sychronicity going on, as the Biography channel has just done features on Deep Purple, and on the Machine Head album.)
Back to the Rainbow thing, they seemed ot be hinting that Ritchie might be due for a rock venture again (maybe Blackmore's Night has about reached a logical conclusion). Maybe I'll dust out that classic Ritchie riff that I wrote and send it to him (I sent it to Ian Gillan, but he said that Purple only do their own material).