I was dreaming about this as well!
Some counties are really poorly represented with juniors and can’t even get a team together.
It has to be a five court hall at the minimum to encourage singles to be played.
Get coaches to work and be paid for junior holiday sessions. Half terms and long holidays. Am and pm sessions to make it attractive for coaches to have group sessions and earn an income.
Free training is a bit difficult because some people will just freeload it as baby sitting service. You then get kids sitting around affecting the kids who would be more proactive. Some of our German forum member have noted this problem.