It's good, but Satan's Whiskers is in the same nature and better, so chances are I would make that rather than this. The lime juice is what makes this interesting. I faked Old tom with a mix of Tanq and Hendricks, which may — ★★★
High Five — Gin, Aperol, Grapefruit juice, Lime juice, Simple syrup
This is quite tasty, and I'm not usually a fan of cocktails with orange juice.
I'm a bit perplexed that someone would try to make it with Hendricks and Tanquerey as a substitute for Old Tom, as that combination would taste nothing whatsoever like Old Tom (it would be like mixing Bacardi and Appleton to substitute for Smith & Cross, or mixing Bourbon and Canadian Whiskey to substitute for Rye); mixing a Genever with either Hendricks or Tanquerey would come far closer to Old Tom, I would think. As an experiment, I did try this with a mix of Hendricks and Plymouth (no Tanquerey in the liquor cabinet, I still bear a grudge against the brand for their utterly horrible "mr. Jenkins" ad campaign from nearly 20 years ago) instead of Old Tom, and it was not very good.