I own several on screen versions of Macbeth, including the RSC version with Ian McKellen and Judi Dench, the 2001 RSC version directed by Gregory Doran, and the Roman Polanski cinematic version, so I believe I can safely say that the BBC Macbeth is the one I was most impressed with. Both Nicol Williamson and Jane Lapotaire give impressive performances. Williamson manages to realistically portray Macbeth as a terrified man, and Lapotaire is perfect as Lady Macbeth. This film explores the psychological dimension of the play to a much greater extent than other filmed versions, which emphasize the political. Here, the director delves into the protagonist's mind, and the result is tremendous.
There are many memorable moments in this film, such as Nicol Williamson wringing his hands behind his back as he knows his deed is about to be discovered, Jane Lapotaire with bloody hands pushing her husband towards the bedroom, or the terror in Lady Macduff's eyes as her child is slaughtered.
I also liked the lighting effects at the opening of the play, especially the use of colours for the sky.
I highly recommend this Macbeth to all those who truly appreciate Shakespeare.