They very craftily gathered together a bunch of 'well- knowns' and mixed them with some unknowns, and put the better known ones in the supporting roles- think Sheridan Smith, a bafta award winner, in lesser role as Smithy's sister, or pam ferris as his mum, altogether its the whole mix of actors, placed as the right characters, is what makes this work so well, and yes, the situations they are in which you can see could actually 'occur' in real life, maybe not to everyone, but to some, and how they deal with it- all of it together makes it work.