There's quite a selection of film events coming up in London. First and foremost, I can't recommend enough the season of Glauber Rocha films that will take place at the Tate Modern in London between 9 June and 28 July. Rocha, the leading light of Cinema Novo was, roughly speaking, Brazil's equivalent of Godard. Even though the former died young at the age 42 in 1981, his legacy is enormous and includes masterpieces such as Black God, White Devil (1964) and Antonio das Mortes (1969, pictured), which are all included in the Tate Modern's of programme.
Another iconoclastic director whose films will be shown in London in June is Werner Herzog. The ICA is hosting a season called The Worlds of Werner Herzog between 9 and 30 June, including recent films such as The Wild Blue Yonder (2005), Wheel of Time (2003), The White Diamond (2004) and Grizzly Man (2005), among others. More info from the ICA website.
Elsewhere the Barbican centre is exploring the development of the punk and post-punk movements through a selection of UK and US features and documentaries called Panick Attack! These include Derek Jarman's The Last of England (1988) and John Waters's Female Trouble (1974), to name but a few. More info from here.