Met Office flight planning service
 

The Met Office are planning to improve their service to PPL's and are looking for feedback. Personally, I think the service they provide is excellent for on the day briefing charts etc, but they're now looking at creating a service to help flight planning up to 5 days in advance. If you haven't already read about this and want to add your 2 euro's worth, have a look at their CAPI site.