From doublethink, memory hole and Newspeak to American Flyers and The Flying Scotsman, test your knowledge with the Saturday quiz

1 What is the UK’s largest river, by volume of water discharge?

2 “Off” was the difference between which two hit 1979 albums?

3 Which TV quiz host has won more than $2.5m playing poker?

4 Last photographed in 2013, what is nicknamed the “Asian unicorn”?