The questions
1 Who was played on film by a Hepburn and married to one in real life?
2 The white cat Blanche was misnamed in which painting?
3 What was completed at Promontory Summit, Utah in 1869?
4 What comes next: b, B, kB… ?
5 Gamow bags are used to treat what condition?
6 What was launched in 1982 as the “first new English cheese in 200 years”?
7 Which giants are guardians of the City of London?
8 Which ocean current flows along the west coast of South America?
What links:
9 Pineapple; Omaha; Razz; Badugi; HORSE?
10 Peter Gabriel; Chicago; Led Zeppelin; Van Halen?
11 Hyde Park (1851-52); Sydenham Hill (1852-1936)?
12 Riigikogu; Saeima; Seimas?
13 Avocado; axolotl; chili; chocolate; ocelot; tomato?
14 Andrea Lawrence; Picabo Street; Lindsey Vonn; Mikaela Shiffrin?
15 Light by 1 & 2; Third by 3; Home by 4?
The answers
1 Mary, Queen of Scots (Katharine in 1936 film and James Hepburn, third husband).
2 David Hockney’s Mr and Mrs Clark and Percy.
3 US’s first transcontinental railroad.
4 MB (abbreviations of units of data storage: bit, byte, kilobyte, megabyte).
5 Severe altitude sickness.
6 Lymeswold.
7 Gog and Magog.
8 Humboldt Current.
9 Poker variants.
10 Released multiple self-titled albums.
11 Location of the Crystal Palace.
12 Parliaments of Estonia; Latvia; Lithuania.
13 Words from Nahuatl (Aztec language).
14 Female US Olympic skiing champions.
15 BBC radio changes in 1967: Light Programme replaced by Radios 1 and 2; Third Programme by Radio 3; Home Service by Radio 4.