If it hadn't been for a brief iPlayer promo of this series after a tribute to Caroline Aherne I would never have known it even existed; it's as if the BBC likes to keep some of its best shows well hidden.
It starts off as warped, then progresses through some very black comedy into filth; sheer, utter filth, but very, very funny. At times it strays into territory that even The League of Gentlemen (or Something About Mary if you're American) might have shied away from, but the writing is so incredibly sharp and witty that it casts aside the usual boundaries with ease.
It wasn't until I looked them up on here that I discovered that one of the sisters (Kat Sadler) was actually the writer, with no previous acting credits at all. Then, stranger still, it would appear that Lizzie Davidson, who plays her sister Billie, has never previously featured in anything of any kind. Completing this wildly dysfunctional family is the rather desperate mum, wonderfully played by Louise Brealey, who somehow seems incredibly familiar to me, but not from in anything that I recognise.
Paul Bazely, as mum's prospective suitor Dev, seems one of those characters who you have seen pop up in minor roles for years, without ever really taking much notice. His character is a seriously creepy widower/divorcee/fraudster/murderer - who knows? With his odd lifestyle and strange behaviour, he is the one thread which remains loose and unexplained.
This is of of those very British comedies which could almost certainly never be shown in America, where exploding heads are fine, yet subjects such as abortion within the context of comedy are completely out of bounds. Also ruling out a US showing is the absence of a laughter track, which is thankfully absent here and would have killed it stone dead.
There are probably enough loose ends to make a second series if there was sufficient demand, but I feel it might be better to leave this as a true classic of a one-off (see also Bridget Christie's The Change). I feel that one thing we can be sure of though is that we certainly haven't heard the last of those involved.