Really enjoyed the film, and particularly its commentary on the atomised, insular and dehumanising life in a modern technocracy (although that did make it feel a bit like a premium Black Mirror episode).
I really think it needed another 10 minutes on the front showing Riseborough's relationship with her husband prior to becoming an assassin. We're basically getting the last two thirds of her character arc, and that really drains the emotional impact of the ending out of it. You can extrapolate what her relationship and personality used to be like, but it's an intellectual engagement, not an emotional one. Brooker would have sold us on the relationship with some humour first, then got his grim on.
Definitely want to check out Antiviral too, now.