Blue is still losing coolant so I'm quite sure that the radiator is leaking somewhere. As Blue is an Acclaim with a Triomatic it has a slightly different radiator which has a cooler for the transmission fluid. It just so happened that I had a spare radiator for a Triomatic that had been bought for my first Acclaim back in July 2005, had been carried across to Becky and was replaced with the correct radiator some time later. A quick rummage in the shed soon turned up the radiator. I've stashed it in Becky's boot until I can get it tested to see if it can be used.
On to the upside:
I got the call from my local MotoSave. The bushes had arrived so when I went over I was offered them both (MotoSave had ordered 2) for £5. I think it is a good idea to have a spare one as they don't last forever. They are used on Minis (proper Minis, not the MINI made by Bimmer) so at least I'm raiding the BL parts bin. I haven't posted any photos for AGES so here we go with a pic of the bushes: