In England and Wales each congregation is registered separately as an individual Charity. In the case where the KH is an asset owned without debts I would assume the charity holds the asset. So for a London cong who are sitting on a multi-million GBP asset it would be interesting to see what happens if the cong was dissolved.
"Brothers we are selling the KH for 2 million pounds - there are 100 publishers - where do you want us to send your 20k check?"
Not gonna happen.