Below are a few links to weather websites that will be useful to decide if the day ahead ifs flyable.
This is a great site for current conditions. Airfield nearby are Benson and Brize Norton to the north. As a rule of thumb, if any of them are showing a wind of 14mph or more then flying at Stanmore maybe on the upper end of the flyable scale.
Is it going to rain?
Metox offers a weather radar showing rain failing in as little as 5min ago! Definitely worth checking it before you leave home!
A good link to weather forecast. They also have useful weather charts and rainfall radar.