I guess that this year there will be plenty of tickets for NHS staff and competitions, I can't see Stevie Nicks, Shania Twains, KoL selling out. Shania and SZA also did multiple nights at the O2 last year. The days of Elton John, The Stones, Black Sabbath, Streisand etc are gone.. feels like BST are just booking acts that happen to be touring rather than one off events and are avoiding the BIG ones, par Stevie Wonder of course.
Other festivals have done well with one off's like last years Iggy Pop/Blondie/Generation Sex thing and Wide Awake have sold out already - all dayers with smaller genre specific acts and cheaper tickets seem the be the way to go rather than potentially seeing Stevie Nicks at a too big venue for £200