The first port of call for all budding tennis players is the Lawn Tennis Association (LTA) website, which gives a list of all clubs and courts that offer mini tennis coaching, specifically designed for children. Mini tennis uses smaller courts, lower nets and lighter balls to teach kids the basics of the game and begins with Red for kids under 8, progresses to Orange for 8 to 9 year olds and then Green for 9 and 10 year olds.
You don’t necessarily have to be a member of a club for your kids ito get involved in their coaching or summer camps. Some clubs offer a pay and play scheme for their courses and lots of coaches run courses and camps in local parks on a pay and play basis.
Also check out the Allplaytennis section that gives a list of free courts in your area.
If you kids seriously get the tennis bug, the LTA can provide a list of competititons in your county, which are aimed at new to serious players.
And if your kids get themselves an LTA rating, sites such as Tennis Goat will, for a small fee, pass on the names of kids of the same age with a similar rating who live in your area. They can then compete among themselves on any courts nearby.