UK Synoptic chart (Bracknell)
Sat24.com - realtime satellite images for Europe
Nympsfield forecast (Sid)
Long Mynd forecast from Weatherweb (Simon Keeling)
XC weather - Actual and forecast conditions from weather stations around the UK
RASP - Regional Atmospheric Soaring Prediction
Met Office - UK Weather page (rain radar, temperature, pressure etc.]
Met Office - sheets 214 + 215 (requires login)
Met Office - UK TAFs and METARs (requires login)
Met Office - UK rainfall radar
Met Office - Brecon Beacons mountain conditions forecast
Weatherweb: Aviation page - other pages on this site worth looking at also
Glidemet - gliding and soaring weather forecast for southern Britain (no weather updates at present, but some useful links)
Metcheck
Weather data - links from Weatherjack
Brecon weather (5 day and 24 hour) - [BBC]
Dunstable forecast
Net-weather - Weather forecasts, news and information for the UK. A good overview
RMI: maps page - Royal Meteorological Institute of Belgium
Bernard Burton's sat pics
Meteoblue - Technical stuff
Weather online - Good for charts
General Tomfoolery - Aeromodellers' weather site, live UK wind info
Talgarth Airfield [Black Mountains Gliding Club]
Usk Airfield (South Wales GC)
Littledean Hill (Forest of Dean)
Wye Valley Webcam - different views can be selected
Snowdon
Aston Down - looking NE. includes previous images at 15 min intervals
Cambridge Gliding Club
Hus Bos - webcam SE
Llyn peninsula - 1
Abersoch - Llyn peninsula - 2
Newgale Bay - Pembrokeshire
Webcameras UK - over 450 web cameras to choose from...