Only Abraham Valley and I'm Going Home have been widely available in Britain. I got a dvd of No or the Vainglory of Command from French internet shop Fnac. I was slightly disappointed as my expectations were so high (from its selection by Jonathon Romney in the excellent book Film: The Critics' Choice, by Gilbert Adair in his superb book Flickers, and its place in Claire Denis' top 10). It covers several quite diverse episodes (often none too glorious) in Portuguese history, as recounted to his colleagues by a soldier fighting in Angola. The main battle scene betrays its low budget (and there were difficulties encountered during filming) but is still impressive, and though the film is not always to my taste (there's one bold surprisingly kitschy segment) it's never less than interesting, provocative and original. When walking a stretch of local canal here, i invariably think of the film's lush Angolan vegetation and the opening sequence. 

Aniki Bobo (1942), a film about children in the "neo-realist" style apparently, has a high reputation and was selected as one of the BFI's 360 Classics. Amor de Perdicao (1978) was a breakthrough for him and is generally considered among his best.

If only such films were accessible. 