Just been to my local Heron in Wellington Telford to pick up a couple of things and on the small rack near the exit door they have 5x packs of Ritter Sport scanning at 59p. I suspect this is a glitch and they are meant to break them down to singles but the top shelf is filled from front to back with 5x packs in 4 flavours that are scanning at 59p. Marzipan, Peppermint, Whole Hazelnuts & White Whole Hazelnuts. If it is a glitch then they are likely meant to be 59p per bar which is still better than the recent co-op deal and the best deal I've ever seen on them. There wasnt a price sticker on the shelf which further leads me to believe they have put them there ready to break down to singles. So go there for the best deal of 59p each, or go there right this second for 5 for 59p :D
They are dated to end of August.