Trying with a recently acquired (and rapidly disappearing) bottle of ford’s gin. Lovely dry, aromatic and complex. Eminently drinkable at first, then some of the bitter elements linger, adding depth. I love the excellent balance of sweet, dry, sour and bitter here. And the lemon twist works a dream.
Some more about this being the "favourite pre-luncheon tipple" of the UK's previous monarch can be found in this 2003 piece in the LRB https://www.lrb.co.uk/the-paper/v25/n22/thomas-jones/short-cuts. Note in particular that this source suggests equal parts were preferred, not 2:1 as specified in another comment.