For anyone UK based I can highly recommend Jazz School UK – The Shoefactory. They run courses through the year and get in the very best UK teachers, including Steve Waterman for trumpet.
https://jazzschool.co.uk
There are others.

If you want private online tuition with one of the best players in the UK I can recommend Neil Yates. Watch his Jazzometry presentation.

His website https://www.neilyates.co.uk

His approach is very original and well worth exploring.