What is the oldest pub in London still in operation today?

Answer 1

There are a variety of claims to this title (see article in sources). The George on Borough High Street is definitely the oldest galleried inn - as it is the last.

Answer 2

There is no definitive answer, because a number of pubs call themselves the oldest, when in fact, they're not. Buildings have been destroyed and rebuilt, names have been borrowed from long-defunct taverns that were in the same street, etc. It's an old argument that's never been settled conclusively.