19. Trellick Tower, North Kensington

Source: http://upload.wikimedia.org/wikipedia/commons/4/40/Trellick_Tower_02.JPG

A slightly controversial addition to our list, the 31 story Trellick Tower is a well-loved Brutalist London landmark, designed by architect Erno Goldfinger in the late 60s and early 70s.

20. The Lighthouse, Glasgow

Source: http://texasroadies.files.wordpress.com/2013/05/kew_2012_0813_1760.jpg

Originally the offices of the Glasgow Herald, the Lighthouse was built in 1895 and today houses the Glasgow Centre for Design & Architecture. How appropriate for a Grade A listed building?