konceptual99: I think Searcher has misread some of the info on the org website.
It's a pity that The Searcher doesn't seem to be around any more
Although I don't believe any of the 35 London KHs in the OP are up for sale yet (are they all still being shared by two or more congregations?)
Interestingly, in this thread, I did list four London KHs that where being used by just one congregation each (the most likely to be sold?):
London, East Molesey at 70 High Street, WEST MOLESEY KT8 2LY
London, Richmond Park at 29a Alexandra Road, KINGSTON UPON THAMES KT2 6SD
London, Swanley at Bremner Close, London Road, SWANLEY BR8 8TG
London, Tolworth at 16A Derby Road, Tolworth, SURBITON KT5 9AY
https://www.jehovahs-witness.com/topic/5760931004940288/_post/4707357072293888
And now Richmond Park's KH in Kingston-upon-Thames is up for sale!
Seems likely that the congregation will move to the neighboring Tolworth KH - also listed above - which is 2.6 miles away.
Looks like WT is asking £1,000,000 for the Richmond Park KH (US $ 1.3 million)
hat tip https://www.jehovahs-witness.com/topic/4803910902480896/wtbts-britain-selling-another-kingdom-hall