Mike - "Still, if they're saying "We might produce a million of these" then you have the right to quote accordingly. If they choke on the quote you give them, then that means they're not really anticipating that kind of success. The problem with taking only a small "per copy" royalty rate, and nothing up front, is that if they only sell those hundred copies, you'd get almost nothing.
It would be crazy for you to count on a big publisher picking it up... if big publishers were so interested, they wouldn't be doing this self-published thing in the first place."
I'm not counting on a big publisher picking it up and I suspect a quote based on really letting him have the full rights to the result will make him choke. But I'm not prepared to just give away my time and effort so will be giving a quote when next asked.
Numina - "As Mike says, if this is a true DIY project and you really think it could take off then you would want to stay on good terms with a reasonable low rate where everyone is happy and then hope they keep you on-board for the big pressing".
That would be my preference, but the money man has already said he just wants the rights and no later legal issues.....so again he'll get the quote - with the £650 a minute figure thrown in to begin with