http://www.cadastral.com/2011jan.htm
is an online source of ephemeris for the sun and Polaris (page for jan; you can work out how to get other months yourself!)
Hope not all are reposts - I didn't spot them above anyway.
This site is free online almanac for mobile phones (iphone and android)
Has everything: tides, weather, passage plans, marina guide, first aid, ROR... the lot.
Sam Steele's site is also a useful resource for anyone thinking about this sort of trip, or indeed just looking for a load of advice/inspiration from experienced sailors.
Acorn Engineering at Ashton -u Lyne (acornengineer.co.uk) are by the canal side so inevitably have lots of narrow boat stuff but also have many of those hard to source items of an engineering or electrical nature. Their catalogue must be a bible for boatbuilders.