Adding to the fun, swap out olives for a cocktail onion and you have yourself a Gibson.
The owner is the amazingly talented Marian Beke[1], whom I got to know while living in London and frequenting Nightjar, another fantastic establishment – in the same neighbourhood no less! If you're ever in the area, you should definitely go for a visit.
NB: Beyond being a bit of a drunkard, I have no affiliation with any of the above.
[1]: https://www.diffordsguide.com/people/11764/bar-owner/marian-...