Some early pubs even change counties at times, and in about 1965 many former couunties near to London did become part of London, as specifically mentioned, now being in a London borough.
I have pages of these pubs in 2018/19, about 51,000 of them in total; and many are now part of London. Others around the country, in the southern end of the country are also listed, some are not. The entire listing is here.
And here is Brent, well now moved to the pubshistory.com blog