Came across this charity set up to get free tennis in all park tennis courts nationwide.
All you need to do is put in your post code and it tells you where your nearest free courts are or your nearest coaching times. Its for kids and adults.
What they say..
We work with schools, tennis clubs and local authorities throughout the UK giving children, young people and families the chance to learn and play tennis for 50 weeks of the year FOR FREE (as part of our free coaching programme).
We've also profiled every public park tennis court in the UK, and, those that are FREE, are listed on this website to enable you to find your nearest free tennis courts, allowing you to just turn up and enjoy a game.