I tried to put it off until the vernal equinox, but the chain started slipping, so it was time to fettle the commuter.
Before:
After:
New large chainring, cassette, jockey wheels, chain, front tyre, and swapped front to rear.
What commuting every day does to your poor old bike:
And the chain wear:
Main problem was getting the new marathon 25 on. What a pig!
Eventually resorted to tyre levers, but severely regretted it - God's way of telling me my rim is worn, I guess...
Finally got it on my spare wheel, then the valve detached from the tube on inflation so had to do it again!
Off the LBS now to drop it off for a re-rim.