I thought he did OK. I kept thinking "I'm sure I know this guy" though.
I only saw the last 30 minutes while looking for something watch before BOTS.
I already knew something of the story of Watson-Watt and I thought this
was quite plodding. What is amusing is that they cannot dramatise the
solving of difficult engineering problems, so we get shots of them
writing furiously on a blackboard which somehow misses the detail
of what they actually achieved. Instead we have personality clashes which
probably got played up more than really existed in practice.