Thanks everyone. I now have in my garage a radiator that fits
Rang the guys at Adrad yesterday afternoon with Johns details, they went and got a RG302 off the shelf and measured it and it was 594 between the bottom pins :-) they recon the mold has been updated. So I ordered on teh spot for £46 inc vat and delivery, and its now in my garage, a quick test and it fits perfectly.
Thanks all, shows the true usefulness of this forum.
