Finally got round to fitting a 42 tooth rear Sprocket along with new chain, wow, what a difference it makes, it's like a new bike, so much easier to ride in town at slow speeds. Multi should come geared that way from new. Highly recommended mod ....
I've got my full sprocket/chain set, waiting another 1000 kms to do the change. I am hoping for a more usable 6th gear rather than driveability in the city (don't mind using the clutch more). Sounds like nobody who did this ever goes back.