Was in much the same pickle for work, needed something to keep me warm and something that was waterproof and quick drying. In the end, I opted for an Ex-police Goretex bomber jacket from ebay for £35 and an ex- british army Poncho (essentially a large piece of green tarpaulin with numerous press studs and a hood) for £16 from some army and navy place. Already been out in torrential rain and wind and its bloody freezing here to, and I was dry and warm as toast. Might look weird walking down the high street in a poncho though, but where I am working, Only the rabbits and badgers are taking the p1ss.