Thanks, but Brampton cistern wont fit 4-hole pans, unless there's a convertor plate or something available (I have a call into Mathewson & Rosemond, mention in this thread a few posts up). Apart from the mounting, the cistern looks the same.
I know this is an old thread, but I have a similar problem; I have a Twyfords double trap siphonic pan and the cistern is fixed to the pan by four bolts. My problem is that the cistern has a hairline crack and will soon need replacing, but sourcing the correct one is an expensive nightmare...