Time After Time (1979) is still my favorite London-set film, although only the first third is actually set in (Victorian) London; the rest takes place in 1979 San Francisco. And if you want to count TV miniseries, QB VII (based on the Leon Uris bestseller of the same name) is predominantly set in London, specifically the government's Queen's Bench Seven courtroom (hence the title). There's also Oliver! and My Fair Lady and Mary Poppins, and I seem to recall A Clockwork Orange being based at least mostly in London, albeit a postulated future London. Ditto for 1984 (the Sir Richard Burton version from the same year).