We've been getting lots of graupel here today too. I think you can almost see the difference between graupel and snow showers on the radar - to me graupel showers have jaggy edges whereas snow showers look much more smooth. Graupel showers also tend to become smoother the further inland they get.
Despite doing a meteorology degree, I must admit that I'm not completely sure what atmospheric conditions lead to graupel formation... However, something to note is that showers really should be pepping up during the next 24 hours as much colder air at 500 hPa floods in (see 2 pm today vs 2 pm tomorrow). The North Sea snow machine is already producing pretty beefy showers so somewhere is really going to get pasted.