The prospects for any new courts are not bright since the required investment will require substantial donations from wealthy individuals or institutions who are not concerned about return.
Having said that, the obvious places for new courts would be at independent schools or universities, with a strategic preference from the T&RA for the latter so that more students can continue to play after school.
Cambridge University had a court which was demolished some 40 years ago. In recent dialogue with the CU Director of Sport, he expressed the view that a new Rackets court is not a high priority whilst others connected with the university have said that, if the money could be raised, a site could probably be found.
We are not aware of any conversations or expressions of interest from other universities or any schools.