I guess it's milking the cow a bit, but they've put out 2 shows to celebrate Suchet's 25 year run as Poirot. And who doesn't love Suchet as Poirot?
The first is Being Poirot, a doco on everything Suchet did to become Poirot, from reading every one of the 48 or so books, to talking with Agatha Christie's descendants, to going to Belgium to meet the Chief of Police.
The second is Poirot on the Orient Express, where he looks at everything relating to his most famous case.