In keeping with David Hockney's justifiable title as Britain 'greatest living painter'™, Tate Britain have announced an unprecedented number of 20,000 advance tickets sales. 

This is a major retrospective by one of Britain's foremost artists. And, at nearly £20 a ticket, it's a fantastic reminder of how committed the art-loving public are to seeing blockbuster exhibitions. 

With the cost of theatre and music concerts prohibitive for many, the evening 'gallery-date' and obligatory after-visit coffee-and-discussion seems de rigeur for thousands - millennials and pensioners included.