Handy hint for anyone else: don't overlook the little bit of the outer face of the crank just round the pedal thread. Any contamination on that surface (and on the corresponding surface on your pedal spindle) is liable to torment you with clicky creaky sounds.
A good clean and a smear of grease seems to have sorted the problem. I now have a spare bottom bracket, a spare chain and spare chainring bolts. And the shiny new chain is a bit grumbly on the sprocket.
Aaah. Blessed relief. The clicking has stopped!
Handy hint for anyone else: don't overlook the little bit of the outer face of the crank just round the pedal thread. Any contamination on that surface (and on the corresponding surface on your pedal spindle) is liable to torment you with clicky creaky sounds.
A good clean and a smear of grease seems to have sorted the problem. I now have a spare bottom bracket, a spare chain and spare chainring bolts. And the shiny new chain is a bit grumbly on the sprocket.