Let me get this right. You want a 1500-2000 word celebrity interview for about £100. You want to use my contacts and my writing skills and you want to pay a word rate from 1970. And you want good grammar...
What date would the magazine be on the stands? I would have a shot at getting you a pretty good name but it very much depends on the on-stand date.
on the money
My little sis works for one of the biggest celeb mags in the pop world and i knwo they would fry her alive if she ever thought of selling on her stuff - the best mags have their writers so contracted up to the arm pits that they would kiss good bye to their careers if they ever considered this
Just a note about your suggestion regarding re-nosing a previous interview - most celebs I have ever interviewed would be furious if I then re-wrote it for a different publication without them agreeing to appearing in it! I don't wish to tell you how to run your magazine, but it would be worth being wary of this and ensuring that what ever celebrity you do use has agreed to it. I would love to bid for an original piece if the budget was higher!
Keep in mind that you have more chances to win a Job with Case Study as fewer Sellers will send a proposal. Moreover the Buyer has already paid a fee for it, which shows that they seriously intend to award the Job.