Maybe I'm being charitable here, but I felt the "lack of chemistry" between the leads that so many criticise here could have been intentional, a trope for repressed emotion or the etiquette of the time. Yes, there are some major flaws, some clunking (such as the keyboard-sniffing, rat capture and of course, the damp squib of an ending), but there's also a lot to enjoy, particularly if you are a Rickman fan. But yes, some more historical context would have been good, it feels like an afterthought, and perhaps a deeper examination of whether the affair was set up from the start by an impotent husband.