I think I've got this sorted out now. After some detective work on the web, it looks like all three part numbers refer to a Febi part 09388, which I've managed to get Camberley Auto Factors to order in for me. £5.45 + Vat + carriage, total £24.56 the pair. Should be able to pick them up tomorrow.
What was the final outcome? Is the bush the same for both ends of the trailing link and cross member, any other part numbers/suppliers we would find usefull? I think mine might need doing soon.
PS to moderator...if ewelme no longer on this forum can this be forwarded to him?