Good thread Rob, totally relevant to my next 3 months of London winter. I was thinking about all the things you mentioned couple weeks ago and decided on the following. If anyone knows for sure please inform!

1 - Fuel - Im thinking if i fill tank to the brim it will reduce ability for condensation/ice to build up inside tank...? obviously drain before next outing.

2- Coolant / water - definitely coolant for the cold

3- Brakes - refreshing the fluid just before next outing

4- Oil and filter - as above

5- Anything else? Butt plug to stop oxidising of cylinder (?)