There was a Speedwell (repainted bright yellow) frameset doing the rounds on eBay last week - auction seems to have ended now though. Would be interested to know what the winning bid was!
Speedwells weren't without their problems (apparently the ride was very whippy as they used pure "CP grade" Ti rather than stuff alloyed with vanadium and aluminium in similar tube diameters to steel tubesets of the day) but seem to have had better structural integrity than their Stateside contemporary the Teledyne Titan.
"Not so much a religion as a savings club for people who think Star Trek's a documentary"
- Marcus Brigstocke on Scientology