Removed old chain and cassette (well past 1%)
Dismantled chainset, cleaned & re-assembled
Removed jockey wheels, cleaned RD, re-lubed jockey wheels, re-assembled
Installed new cassette (12-30 in place of 13-29) and new chain.
Rerouted RD cable so as to reposition gel pads under bar tape (as some hand pain after BCM600)
Re connect everything and re index gears.
Retape bars
Now typing with grubby fingers.