A plus-guest Tate membership will run you £120 if you pay by Direct Debit. As the name implies, It grants you and a guest free entry to every show in every Tate, which includes Tate Modern, Tate Britain, Tate Liverpool, and Tate St. Ives, as well as the Barbara Hepworth Museum and Sculpture Garden. You also receive a 10% discount in the shops, and access to the various Tate member rooms.
It is, without hyperbole, the best thing I have ever owned.
The London portion alone is worth the price. It's the absolute best way to entertain visitors to the city, and also the chillest place to spend a Friday night working on your unfinished novel. It's worth it even though London is probably home to the most free quality art in the world. At £10 a month, the cost of a fancy lunch at Itsu, you're practically stealing from them, stealing priceless works of art right from out of their generous, loving hands.
It's so rad.