Thanks for all the responses – looks like I'm not the only one fending off the forces of progress 😉
I think I'm going to look for a replacement ST crankset- any recommendations for stockists?
Speshpaul – in answer to your questions:
Why replace the chainset?
It's the OEM one which came with the bike – (Shimano Alivio I think) – it's about the only remaining bit I haven't replaced or upgraded (been through several sets of chainrings though). Worked fine until I stripped part of the drive-side pedal thread due to poor spannering. Holding for now but paranoid it's going to give up the ghost mid ride.
Why change the frame?
No reason other than I'm looking to get a steel, singlespeed specific frame at some point.