On one radio episode of Dead Ringers, The Doctor (voiced by Jon Culshaw) 'phoned up Dickinson to ask him how much he could get for a Magnetic Core Extractor that was believed to be owned by the Doctor when he was Jon Pertwee.
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Past co-presenters have been Mervyn Stutter (Series 1-2), Jon Culshaw (Series 1-5), Emma Clarke (Series 1-5) and Jo Caulfield (Series 6), although these varied in some weeks.