Weather, Time & NOTAM data is available. There is a

Time Check from the US Naval Observatory
BBC Weather Links, local forecasts, infra-red and radar satellite pictures, with moving replay of satellite pictures
Met Office - TAFs, METARS, AIRMET forecasts, Surface Pressure Charts (3-day), infra-red and radar satellite pictures, cloud and pressure composites, registration required (free for basic info)
NATS - NOTAMS, Aeronautical Information, UK Aerodrome Information, UK Daily Navigation Warnings & Bulletins, Red Arrows and Royal Flight telephone numbers.
Royal Flight, Red Arrows & Temporary Restricted Airspace Freephone: 0500 354802
Tephigrams - University of Barcelona, Spain for many European and UK locations