Flight Planning
Local Weather, TAF & METAR
UK & European Aeronautical Information Services
Flight Plans
You can look the ICAO Designator for your aircraft type using the ICAO search facility here.
CAA Safety Sense Leaflet 20, VFR Flight Plans
CAP 694, The UK Flight Planning Guide
RocketRoute : US + Worldwide Flight Planning and Filing [ Sponsored link ]
UK NATS AFPEx (Assisted Flight Planning Exchange)