We will all have different views about what the appropriate level of overall funding for the Arts should be but the paltry proportion which Jazz receives (which is totally disproportionate to relative audience sizes) and its concentration on London is a scandal. From information compiled by Chris Hodgkins in 2019:
According to the Arts Council about 3.4 million people attend Classical music concerts, 2.1 million people attend Jazz concerts and 1.7 million people attend Opera.
However in 2018/19, Opera was due to receive a total of £57.1 million of which 32.5% would be spent outside of London. (The Royal Opera House alone would receive some £24 million.) Classical music would receive £19 million of which 55% was allocated to the English regions, and Jazz would receive a total of £1.6 million of which 30% was to be spent outside of London.