Just spoke to TF, very helpful as always. They reckon it is probably a tight bushing problem as I thought – apparently bushings on lyriks are a bit of a lottery. Other alternative is that it could be a bone dry bushing as the forks have probably been sitting for a couple of years. I’ll leave them inverted for a while to see if that helps, and maybe whip the lower legs off to inspect the bushes.
Not sure whether to:
1. take them back (I can imagine this will be a pain, trying to report a fault on a brand new fork, although I may be able to exchange on the basis that there is a moderate scratch on the lowers and the disc hose guide has been slightly ground off)
2. relube and attempt to ride them in (which won’t work if it is a bushing problem according to TF)
3. cut my losses and send them to TF for a busing resize/tune (for £80).