I think the comment about cast iron bladder is the governing factor here <VBG>. If you use Peterculter then phone to see they have sufficient fuel beforehand or you might get a surprise. Alternatively, PDG have fuel at Kintore but you'll need to arrange with them beforehand. To be honest, RRRF is a pointless exercise IMO you'd be better off with a more civilised break at Cumbernauld.