Free is still free
The savviest way to save money, of course, is not to spend it in the first place. Most major London museums are free, including the British Museum and the Tate Modern (which opened a space devoted to performance art last year). Likewise gratis: the Ulster Museum in Belfast, the World Museum in Liverpool and the Kelvingrove Art Gallery and Museum in Glasgow.
If you hit Albion in August, head for the Bristol International Balloon Fiesta — Europe's largest annual hot-air balloon gathering — and the Edinburgh Fringe Festival; both events are free. Every U.K. city makes free walking tours available via apps; I'm partial to the Charles Dickens London Walking Tour and the Walking Heads music tour of Glasgow. And speaking of music, one of my favorite freebies has a quintessentially British air: It's the classical music played every weekday around lunchtime inside St. Martin in the Fields, a church in London's Trafalgar Square.