Back in the 80s I used to commute with a Moulton fitted with steel wheels. When I first used the Moulton in wet weather I noticed the very poor braking, but this improved greatly when I fitted Fibrax leather brake blocks. I have noticed that Fibrax leather blocks can still be bought on eBay, for example this supplier. http://www.ebay.co.uk/itm/like/25165721 ... mp;ff13=80
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So much muck collects on the rims and shoes after a weeks worth of riding that the first rain seems to turn this stuff into slippery goo, a alcohol wipe-down of the rims and shoes to remove this stuff seems to help "some" for a little while. Just a thought, until your new shoes arrive.
A quick update on this. The bike has been hanging in the workshop, so no riding was done during the winter!
I replaced the pads with the ones with leather strips. Went out yesterday in the dry, but happened upon a deep puddle...the brakes were just as bad after getting wet. So I think this one will just have to be for dry sunny days out!
If brake blocks become glazed, rub some T-cut on them and rub off. Softens the rubber and helps. Alloy rims much better. Even a cheap pair for wet weather possibly.