Inland Waterways - details and guides to canals and other inland waters.
Other sites with routes / trip reports
Sean Morley paddled round all the inhabited islands of UK in 2004 - a stunning trip, well documented here.
Many of the bloggers have excellent pictures and write-ups of their trips - check the Other Sites page.
NWSK's web site has some reports on trips.
Swaledale Outdoor Club has some excellent illustrated trip reports covering trips in a variety of locations.
Sea Kayaking in NE England - lots of info for the NE coast, including Holy Island and the Farnes.
Song of the Paddle, although dedicated to Open Canoes, provides a useful reference to places to paddle.