The one I liked best they messed with the original story a lot (in that it wasn't a Miss Marple originally). But it had Burn Gorman in the very first Non Owen Role I ever saw him in (of course now I have seen him in many Non Owen Roles), and it had several other Who/Torchwood people, including Camille Coduri and Burn's and her characters had a fling which... well, contemplating Jackie and Owen... and Jane Seymour was his mother and Richard Armitage his brother (adopted in both cases) - the other Whovian was Gugu Mbatha-Raw as his sister who i want to say was also in love with RA's character but that may have been another - there was quite the brood of adopted children.