Cycling:
Brompton
Sheldon Brown
Cycling facility of the month
Park Tool Repair page
Chain Reaction
Evans
Wiggle
Parker International
Kinetics
Folding Bikes, Bath
A to B
CTC
 
Weather:
The uk.sci.weather FAQ
Horfield (Bristol) weather
Isle of Wight weather
Isle of Wight weather - storms
Meteox rainfall radar
Met Office - cloud types
Nailsworth weather
NOAA - Recent UK marine data
Philip Eden - Climate UK
Roger Brugge - Reading University
Will Hand - Haytor weather
 
Webcams:
Antarctica - Scott Base
Bristol - BBC JamCams page
Bristol - view over harbour
Bristol - southerly view from Royal Fort
Camvista website
Cornwall - various
 

Webcams continued:
Cornwall - Padstow Lifeboat
Devon - Haytor
Devon - Dartmoor
Devon - view across Plymouth Sound
Devon - Starcross
Gloucestershire - Kemble Airfield
Gloucestershire - Nailsworth
Guernsey - view from St Peter Port
Isle of Wight - Bembridge Airport
Isle of Wight - Calshot Spit - various views
Kerry - County Buildings, Tralee
Kerry - Denney Street, Tralee
Kerry - Main Street, Killarney
Leeds - Millennium Square
Lyme Regis - various
London - Leicester Square
London - Southgate ARC, Enfield
Manchester - Exchange Square
Manchester - Oxford Road
Manchester - skyline
Scotland - Aboyne, Aberdeen (Met Office)
Scotland - Aviemore (Met Office)
Scotland - Fife flying club
Scotland - Oban
Scotland - Orkney - Kirkwall airport 1
Scotland - Orkney - Kirkwall airport 2
Somerset - Burnham-on-Sea
Wales - Caerphilly
Wales - Cardiff Bay
Wales - Monmouth
Wales - Snowdon, looking from Elidir Fach
Wales - Trawsgoed, Ceredigion (Met Office)
Shipping webcams - Cunard and P&O