Interesting article from a leading charities newspaper about The Kingdom Hall Trust, the body set up by the Watch Tower to seize all the halls in England and Wales.
Although the figures are not fully up-to-date, there are some useful numbers quoted here, including:
"The Kingdom Hall Trust has grown its assets from £9.6m to £222m in three years after it took over 1,279 Jehovah’s Witnesses congregations... [and has] become the owner of 726 buildings in England and Wales..."
"The trust’s total expenditure in the year to 31 August 2022 was £25m..."
"...£4m was spent on 'providing places of worship'...”
"...£6m was spent on 'assisting congregations'..."
"...£14m was donated to the Watch Tower Bible and Tract Society of Britain."
This link shows when the trust took over the halls (mostly in March 2022, but some up to two years earlier):
https://register-of-charities.charitycommission.gov.uk/charity-search/-/charity-details/275946/governance
In Scotland (which has a separate legal system and therefore separate charity laws), it seems each congregation is still a charity by itself - the Scottish register has 96 listed.