Channel 4 don't do regular dramas these days but when they do they are generally pretty good unlike the tripe Channel 5 tends to churn out.
I just had to bingewatch this. It was good once you got beyond thd suspect accents plus just a few recognisable actors (I did have to check imdb to refresh my memory on the woman from Boiling Point while Warren Brown is in everything) so you were able to concentrate on the warts and all story about credible characters that you could believe in and empathise with. Throw in the cattle of the classes too and the writers knew they were onto a winner.
Yes, you had to have the obligatory gay scenes (this is channel 4 the home of It's A Sin after all!) but the rainbow flag wasn't crammed down the viewers throat as in so many films and shows these days.
The gathering in question only really took up small sections of each episode before the finale while the perpetrator wasn't obvious and it was realistic as in it was far from a happy ending for everyone.
A great production surprisingly shown at this time of year when viewing figures are generally low. It was, just the jumping time frames which were a bit off putting.