Understated and all the more frightening for it. We forget at our peril what the Nazis did to their Jewish citizens in Germany - and would have systematically done the same to the British if they had not been stopped.
For me, Johnny Flynn as the young Winton (Jewish ancestry himself) was remarkable in conveying British reserve. Few words, yet able to show thoughts and emotions. Hopkins great but slightly too old for the part – but probably needed that level of star.
Director James Hawes excelled at the intercutting between time and you saw Flynn morph into the older Winton and back as a natural transition not a stylized jump cut - in part due to the way he focuses on Flynn's eyes and their ability to 'speak' and then pulls back slightly .... For me, far more compelling than the ritual intercutting we see with Christopher Nolan' s trademark device. (Found PM's review below ungracious - and missing the point. Far more telling about his own mindset than the film).