I can also recommend the goldtech track hub. If you can live with the colour its a very durable hub. My
main problem in london isnt the rain but the bad roads. I bent the axle of my suzue hub after
a few weeks. the goldtech hub has an oversized axle that is only tapered at the ends where it meets
the dropouts.
since you live in london you can get one from condor cycles. Are you sure salt and rain are such a problem ?
I dont remember ice or snow on the road this winter except for one day. and I havent used my rain
jacket for ages until last week.
winter looks like this to me

http://s2.enemy.org/~sooshee/bike/bike1.jpg