The questions
1 Which national flag has been modified 26 times?
2 What is the first letter that doesn’t name a vitamin?
3 Which late pianist was the first to record all of Beethoven’s piano works?
4 In legend, what joined the yoke to the pole of a Phrygian wagon?
5 In what film did Jennifer Lawrence play the inventor of a mop?
6 What was unusual about Cpl Wojtek, who served in the war with the 2nd Polish Corps?
7 Which writer last visited Dublin in 1912?
8 Which Essex market town is named after a spice?
What links:
9 Mark Berry; Stacia Blake; Jed Hoile; Barry Mooncult?
10 William Huskisson; James A Garfield; Leo Tolstoy?
11 Formerly 1/16 of a rupee; Icelandic narratives; ranging technology; relating to a city; made a god?
12 Cleeks; Crushers; HyFlyers; Iron Heads; Majesticks; Torque?
13 Gracious and glorious (1); long, our and the (2); save and God (3); King (4)?
14 Capitol Complex, Chandigarh; Notre-Dame du Haut; Unité d’habitation; Villa Savoye?
15 Catherine the Great; Éamon de Valera; Adolf Hitler; Julia Gillard; Boris Johnson?

The answers
1 US.
2 F.
3 Alfred Brendel.
4 Gordian knot.
5 Joy.
6 He was a bear.
7 James Joyce.
8 Saffron Walden.
9 Dancers who accompanied musical acts: Happy Mondays (Bez); Hawkwind; Howard Jones; Flowered Up.
10 Died/fatally injured/assassinated at railway stations: Parkside; US president, Washington DC; Astapovo.
11 Palindromes: anna; sagas; radar; civic; deified.
12 Teams in LIV golf tour.
13 Word distribution in first verse of national anthem.
14 Architectural works by Le Corbusier: India; Ronchamp; Marseille and other cities; Poissy.
15 Not born in the country they led: Prussia/Russia; US/Ireland; Austria/Germany; Wales/Australia; US/UK.