I have no experiance of the britpart bushes, but from personal experiance and that of others, I wouldn't bother with the deflex bushes. Certainly the rear damper bushes are a joke (unless your the one in the middle of no where with no rear dampers) and the quality of the rest of their bushes arn't much better.
When I removed them from mine after not that many miles they wern't in a pretty state. When finally removing the delfex bushes from the panhard rod, 2-3 thousand miles from new at the most, I gave up trying to thump the crush tubes out with a big hammer, it had grown in so much that I ended up using a press to get them out. So much for not needing a press to replace them.