How Not To Live Your Life (BBC2, 10pm); EastEnders: The Murders of Lucas Johnson (BBC3, 8.30pm); One Under (C4, 7.30pm); THERE’S no such thing as a simple day for neurotic 20-something singleton Don Danbury in How Not to Live Your Life. It’s not surprising really when he so often plays host to his deceased grandmother’s eccentric carer Eddie Singh and miserly neighbour Mrs Treacher.

However, ever since near unattainable love interest Abby moved out and Samantha moved in, it seems he’s losing some of his more socially awkward habits – though not completely.

He’s certainly stopped spending his time lusting after his former flatmate, which is a big change as the first series mainly focused on his efforts to tear her away from overcompetitive boyfriend Karl.

Series creator and star Dan Clark reveals how the change came about. “The actress who plays Abby (Sinead Moynihan) had a baby just about the time I was starting to write, and she wasn’t sure if she would be able to make it.

“And if I’m totally honest, the producer and I were both saying do we want to do a whole other series where Don is trying to win her over and get her boyfriend out of the picture?”

Despite the loss of the original leading lady, Dan says this second run is faster and funnier. “The great thing about getting recommissioned is that you can focus on all the good things from the first series, all the things I think worked.”

EASTENDERS: The Murders of Lucas Johnson considers Albert Square’s resident psycho preacher who’s been at the centre of the soap storylines this week.

His crime spree began when he stood by while ex-wife Trina died in one of the more bizarre accidents ever seen on EastEnders – she fell neck first onto a rake – before graduating to full-blown murder.

Perhaps this documentary will shed some light on how he managed to get away with it, burying the body in the Square without anyone seeing him and then breaking out in a visible sweat every time someone went within 5ft of Trina’s memorial tree.

THE First Cut film One Under considers the impact of suicide on the London Underground. “One under” is the term drivers and emergency services often use as shorthand for a person under their train.

For many commuters their experience of a “one under” is minimal and from a distance, connected only to the station or their journey. However, for those with direct experience of it, this crucial moment can have a huge impact on their lives.

In the film, drivers give firsthand accounts of their experiences with suicide.

Liaison and British Transport Police Officers also paint a picture of the process of telling a next of kin, such as Debbie Wickens.

She’d been married to husband John for 11 years when one morning she received a text message. It would be the last she ever heard from him, as that morning John took his own life.

She reveals her painful journey towards recovery, giving intimate insight into how she now makes sense of the events leading up to and after her spouse’s death.