I enjoyed this very much a promising start Olivia Coleman and David Tennant make a very good pairing. Have watched Mayday twice now, find it quite irritating, even though it has Lesley Manville in it who I think is a very good actress. Might stick with it a bit longer though as I have only just found out that it's filmed in and around Dorking which is fairly nearby so want to see if I can recognise anywhere even though the story isn't grabbing me. The Killing was spun out over quite a number of weeks if I remember correctly and that didn't seem too long.