Horton rather famously moved his headquarters from Aberdour where he was under the thumb of the fleet commanders at Scapa Flow to Northways in north London, officially because he wanted a freer hand in running his command, but purportedly because Northways was located near some of his favorite golf courses. Horton, an avid golfer, is said to have played a round of golf almost every day during the war, and was generously handicapped at a "financial 8".
I know a bit more about this now, having spoken to one of the archivists at Camden, the borough in which Northways is situated. She told me that Flag Officer Subs moved in there in the early spring of 1940 and took over 2/3 complete floors. She mentioned Admiral Claude Barry to me. A Wren who worked at Northways has written something about her time there in the Camden Historical Review and I'm waiting for a copy so that I can read her account.
There is mention of Northways in the National Archive at Kew e.g. as follows: