Toby Stephens

Jack and Kate continue to fight crime with the sheer force of their sexual chemistry. Her husband wants to move back to Bristol and his ball has a suspicious lump so they're both finding it hard to concentrate, and this week they're on the trail of a missing pop star. Features extended and gratuitous sequences of Kate running in tiny shorts. But then there's also a naked Toby Stephens to even things up. Really good fun.

I don't know what to make of Vexed. At first I only saw its faults. But then, thinking about the wider context of odd-couple comedy dramas - as wide as a krill net, this - I thought, well, at least writer Howard Overman is trying something different. It's not every Sunday night you see detectives ignoring the corpse bleeding on the rug to admire the cornice work.

Scenes like that one will probably have made some of the Sunday night constituency very vexed indeed. But an older audience must surely remember when all crime series were this politically incorrect, and when the central characters were sexist and made anti-gay jokes. Maybe Vexed owes a debt to Life On Mars but it's still remarkable that Jack Armstrong (Toby Stephens) is cracking gags about cancer sufferers, given all the post-Sachsgate rules and regulations. It's as if Vexed has slipped through a hole in the fence during a sentry shift-change at the BBC Trust.

Now five police forces are chasing it round the schedules, turning it into an unlikely recipient for public sympathy.

On balance, I probably want Vexed to be caught before its scheduled end but not before we find out whether Armstrong and fellow DI, the equally self-obsessed Kate Bishop (Lucy Punch) tumble into bed together; because, let's face it, that's why we watch these shows in the first place.

"So, let me guess - obesity and OCD right?" "She's a cleaner." Jack Armstrong (Toby Stephens) bulldozes through tonight's case set in a Priory-style rehab clinic with all the charm of an 80s cop who's found himself on duty in 2010 - a kind of posh, reverse Gene Hunt. It feels slightly stretched to fill an hour, but there's a lot to enjoy here, especially Kate's (Lucy Punch) awkward marriage counselling session.

"So, let me guess - obesity and OCD right?" "She's a cleaner." Jack Armstrong (Toby Stephens) bulldozes through tonight's case set in a Priory-style rehab clinic with all the charm of an 80s cop who's found himself on duty in 2010 - a kind of posh, reverse Gene Hunt. It feels slightly stretched to fill an hour, but there's a lot to enjoy here, especially Kate's (Lucy Punch) awkward marriage counselling session.

The second slice of this jaunty comedy drama about a flirtatious detective duo. While Jack (Toby Stephens) and Kate (Lucy Punch) investigate the attempted murder of a big-money banker by car bomb, he's distracted by nosiness about her love-life and she tries to keep her marriage counselling sessions secret. It's an attempt at a modern-day Moonlighting and for that to work, the leads need to have genuine chemistry. Sadly, these two don't, meaning their banter grates rather than fizzes.

Video: Toby Stephens talks of his comedy role

He is renowned for playing brooding heartthrobs on screen and giving heavyweight performances on stage. But now Toby Stephens has turned to comedy as a maverick detective with a complicated love life in the BBC Two programme Vexed. He told the BBC why this was his first on-screen comedic role.

"I'm trying to build a rapport here!" barks Jack (Toby Stephens) at Kate (Lucy Punch) in comedy-drama Vexed. Well let me tell you now, Jack, it's never going to happen.

Stephens and Punch play mismatched police detectives and for the whole of the first episode there wasn't any discernible chemistry, sexual or comic, between them. They drive around a lot, swapping snappy dialogue and engaging in frisson-packed narky exchanges, but for all the good it does their on-screen relationship they may as well have shouted it out of the car window.

It is never helpful to apportion blame, but it's Toby Stephens' fault. He just hasn't the lightness of touch to do this sort of comedy. His character, clearly intended as a cynical, manipulative but loveable charmer, comes over as an unpleasant oaf, pure and simple.

Lucy Punch, however, is as good as Stephens is bad. She makes Kate likeable, vulnerable, funny and very sexy. But even the sharpest flint can't spark off wet wood.

Well, it's all very well having these brilliant detectives, like Sherlock Holmes and Hercule Poirot and the CSI boffins, all going round smugly knowing everything and solving stuff. Obviously, if you were actually to be the victim of a crime, that's who you'd want investigating, or at the very least diligent, efficient plodders like the police in Taggart. But what about the rest of them, the rubbish cops who don't always get their man and don't have genius-level insights merely by looking at a few stray hairs or a misplaced receipt - aren't they being a bit discriminated against by TV?

Well, that gap is somewhat filled this week with a new comedy drama, Vexed, which boasts a crime-solving duo who won't bamboozle anyone with the cleverness of their deductions. A sort of cross between Moonlighting - the classic 1980s fantasy with Bruce Willis and Cybill Shepherd - and Jasper Carrot's spoof The Detectives, Vexed is a rather entertaining twist on the over-done crime genre.

It stars Toby Stephens and Lucy Punch - no, you'll recognise her, she's been in heaps of low-key British programmes including the more traditional detecting of Poirot and Midsomer Murders, but this is her biggest role so far as Lucy. But it's Stephens who is the revelation, taking a break from playing posh cads to revel in the role of Jack, who thinks he is a smooth charmer and great cop... when in fact, he's so useless he can't remember the names of anyone involved in the investigation (at one point he wonders if the victim was 'Andrew Ridgely' only to be informed that he's thinking of Wham!) and is prone to falling off his chair in the middle of interrogations.

Stephens' performance is great fun and a refreshing change from know-it-all detectives; Jack knows nothing, but is convinced that his instincts are right. "We're police officers," he drawls, "the law doesn't apply to us." Punch's role is to keep him in line and restrain her partner's more outrageous antics but, thankfully, she does get to be funny too.

The plot of this first episode is appropriately silly - about murders linked to a supermarket loyalty card scheme database, which distracts Lucy and Jack into using the info on it to sneak on what her ex and his potential partners are buying. And the comedy elements work better than the drama: it's hard to get really concerned about a dangerous situation when you know that there are not going to be any serious ramifications. So I'm not sure how long the series can sustain its freshness but it's a nice alternative for now.

Peppered with old jokes and a creaky soundtrack, it's a satire on 1980s sleuthing that plays its cards close to its chest, throwing in random old pop culture references in the middle of tasteless corpse-hopping. It may be giving it too much credit but it's deliberately rubbish, although not in a 'crikey aren't we clever at being rubbish?' kind of way.

Toby Stephens veers oddly over the top as DI Jack Armstrong, a character who could have wandered in from the first series of Life On Mars, but his partnership with Lucy Punch hit my wacky offbeat charm button. And what's not to love about a show where the kitten is called Keith?

It is always suspicious when the BBC tries to sneak out a new high-profile series with a star cast in the middle of August, while many people are away. In the case of this comedy drama, the suspicion is well-founded. Toby Stephens plays Jack, a cocksure womaniser of a detective, paired with Kate (Lucy Punch), a no-nonsense blonde. The two solve crimes while trying to sort out their own personal lives and bantering with each other. There are very few laughs.