Beefeater, Tanqueray, Bombay, and Boodles are all reliable, worthy London dry gins. Try Booth's, Gilbey's, or Gordon's if you're in the mood to experiment. Tanqueray No. 10 and Bombay Sapphire are both premium gins: they both cost more, and they're both very good. Plymouth Gin is not a London dry gin, but it is steeped in history as well as botanicals, and makes a damn fine Martini.
Impressively comprehensive lecture of general culture. Don’t they teach kids this stuff at school?