LindyB - yes the title is Pressure- very appropriate as it focuses on the weather forecasts leading up to D-Day.
I saw it during the week and had a particular interest in it, as there's a bit of a back story about the reports from Blacksod, in west of Ireland that were key to choosing the final date for D-Day.
At the time, weather forecasts could only be made by putting together all the available information about atmospheric conditions which was gathered from reporting stations in various locations. As most weather systems in UK come from the Atlantic, and they could get few reports from the middle of the ocean, reports from extreme west of Ireland were crucial.
The Blacksod station (like many others) was actually manned part time by the Sweeney family who also ran the post office. My father was one of the first meteorologists recruited by new Irish met service and one of his duties was to inspect these remote weather stations and check they were reporting accurately. In 1942 he visited Blacksod and gave the observers there a few lectures to improve their recording! So it could be said that my father may have played a role in the weather forecasts Stagg made in the run up to D-Day.