According to the org's website, various congregations will be moving in with other congregations, effective January 1st 2017. (I've only highlighted a couple) In all probability, their own K.H. is/has been sold. Here is a list of London K.H.'s still in existence. A few have 3 or 4 congregations using them. Many have only one.
It will be interesting to see in 12-18 months which ones have been sacrificed for filthy lucre. Central London property prices are too good for the org to ignore!
(sorry about the formatting!)
London, Camden
7 Pratt Mews Pratt Street LONDON NW1 0AD
London, Battersea
121 Heath Road Clapham LONDON SW8 3BB
London, Marylebone
11 Monmouth Road Paddington LONDON W2 4UT
London, Brixton
197a Coldharbour Lane Camberwell LONDON SE5 9PA
London, Kingsland
Kingdom Hall of Jehovah's Witnesses 1A Fassett Road LONDON E8 1DQ
London, Dulwich
1A Scylla Road Peckham LONDON SE15 3NY
London, Hammersmith
1A Poplar Grove Hammersmith LONDON W6 7RF
London, Chelsea
Kingdom Hall 23 Pond Place off Fulham Road LONDON SW3 6QR
London, Kilburn
Rear of 1A Dyne Road LONDON NW6 7XG
London, Hackney
184 Grove Road LONDON E3 5TG
London, Bermondsey (Effective January 1, 2017)
200 New Cross Road New Cross Gate LONDON SE14 5PG
London, Stoke Newington
Rear of 16-32 Stamford Hill LONDON N16 6YA
London, Muswell Hill
33 North Hill LONDON N6 4BS
London, Balham
26 Glenburnie Road Tooting Bec LONDON SW17 7PJ
London, West Green
5A Glenwood Road LONDON N15 3JS
London, Wood Green
Kingdom Hall 1 New River Avenue LONDON N8 7QD
London, Bruce Grove
679 - 685 Seven Sisters Road LONDON N15 5LA
London, Streatham
16 Rutford Road Streatham LONDON SW16 2DH
London, Catford
27 Brockley Rise Forest Hill LONDON SE23 1JG
London, Acton
Kingdom Hall Acton Lane LONDON W3 8NX
London, Upper Norwood
Whiteley Road Upper Norwood LONDON SE19 1JT
London, Earlsfield
Kingdom Hall of Jehovah's Witnesses 349 Haydon's Road LONDON SW19 8LA London, Blackheath Invicta Road LONDON SE3 7HD
London, Beckenham
173 Venner Road Penge LONDON SE26 5HX
London, Wimbledon
Rear of 24 Gladstone Road Wimbledon LONDON SW19 1QT
London, Leytonstone
6A Sansom Road Leytonstone LONDON E11 3HE
London, Croydon
119A Norbury Avenue THORNTON HEATH CR7 8AN
London, Edmonton
1 Shelbourne Road Tottenham LONDON N17 0JX
London, Lea Bridge
5A-7A Hoe Street LONDON E17 4PH
London, Bounds Green
2A Ashley Gardens LONDON N13 5EW
London, Colindale
Avion Crescent Grahame Park Way LONDON NW9 5NZ
London, Mill Hill
The Kingdom Hall The Ridgeway Mill Hill LONDON NW7 1RN
London, Morden
64 Stayton Rd SUTTON SM1 2PU
London, Mitcham
Queens Road WALLINGTON SM6 0AG
London, Barnet
77A East Barnet Road
BARNET EN4 8RN