Jonathan Creek then and now

In the 17 year history of the programme, he has attracted many a love interest carelessly working his way through Caroline Quentin, Julia Sawalha, Sheridan Smith and now, as his wife no less, Sarah Alexander.

Sheridan Smith quits Jonathan Creek

Sheridan Smith has quit as Jonathan Creek's sidekick because she is too busy with other projects. Now Sarah Alexander, who was introduced to the show at Easter as Jonathan's wife Polly Creek, is to take over in the role of his assistant.

The comedy crime series Jonathan Creek returns for its first outing since 2010 and it's still as baffling as ever, although there have been a few changes...

The main change is that Creek (Alan Davies) has left the world of magic and his windmill home for an ordinary working life in an office, having married a lady called Polly (Sarah Alexander). While Polly goes away on a business trip, however, his sidekick Joey Ross (Sheridan Smith) tells Jonathan about a murder case involving an old friend's vanishing corpse in a locked room. Creek decides to dust off his duffle coat to take on the case - one that involves an old acquaintance of his: overbearing cop D.I. Gideon Pryke (Rik Mayall).

This episode had its ups and downs. I did feel myself giving a bit of a cheer when I saw Creek going through his wardrobe and pulling out his trademark duffle coat. The supporting cast performed well, although given that included the likes of Mayall, Joanna Lumley and Nigel Planer it's not surprising. What was surprising, however, is that given how energetic Mayall usually is it was interesting and refreshing to see him perform a role which demands almost no movement. There were some funny moments too, such as when Joey believes she has discovered a code, only to find out that Creek has solved it already. The way it's revealed was hilarious.

However, in terms of the case itself, there were some flaws in it. My brother was watching the episode as well, and remarked on one of the clues, which was a pair of footprints right up against a wall. The way the footprints were formed we by a pair of shoes being dropped from a high window and landing perfectly next to each other just in that spot. As my brother pointed out, surely the shoes would not have fallen straight to the ground, but tumbled as they fell.

So in this case, the performances as we good, but the writing could have been better. A new series is in the works so hopefully the show will return to form.

I hope Mr Hall, the BBC's new Director-General, sat down that Monday evening and watched Jonathan Creek and quietly applauded. I can't remember a 90 minutes - actually I can, Doctor Who last week, but this one isn't really for children - I enjoyed so much. Oh, bits are always beseechingly silly. And it comes along so seldom that we're almost bound to enjoy it. But this was still a winning showcase for simple, entertaining, catch-all British drama. So we got a jaunty-spooky theme tune reminiscent of Harry Potter, we got Joanna Lumley, we got both Rik Mayall (still impossibly handsome and delightfully hammy) and Nigel Planer off The Young Ones, a body that had escaped from a locked room, Sheridan Smith playing feisty-naughty modern, as is her winning wont, another body felled by a gargoyle pushed off a mansion (that was Midsomer or possibly Wycliffe), some good gags about academics and, of course, Alan Davies.

His Jonathan is married off now (to the very sexy Sarah Alexander) and has, and you can't quite blame him, thus reluctantly had to put on a suit and get a good job in her daddy's advertising agency. For a few minutes he actually looks rather cool and rather suited in fact to both the Don Draper comportment and life. But soon, excuses combine to let him dig out the old duffel and go off to solve impossibly complex cases with the singular hangdog exuberance that holds the whole extraordinary thing together. Some serious bits, too, not least when Ms Lumley, playing a lifelong atheist, suddenly realises, and with a certain horror, that everything she has ever believed might not be true. This occasional series might not change the world, but it should change the way we remember just how solidly good simple entertainment on the BBC can be when it has the guts to go with its own happy formula.

Jonathan Creekused to be on every week - and, OK, it was a decent enough show for a Saturday night.

These days it pops up once in a blue moon, as a one-off episode like tonight's (9pm, BBC1), and for reasons I can't quite fathom, it's trumpeted as some kind of major TV event.

All right, maybe I'm being a bit harsh. Maybe my opinion is clouded by the fact Alan Davies gets on my wick.

But packing an episode with guest stars - tonight's include Rik Mayall, Joanna Lumley and Sarah Alexander - and giving this plot more twists and turns than a twisty-turny thing, can't disguise the show's basic weakness.

Namely, that the "body mysteriously vanishing from a locked room" business, though admittedly only one element of this latest case, is kind of tired now.

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Although this sitcom has never quite managed to be as good as the sum of its parts, it's been easy enough to watch.

And in the last episode tonight, it's a mini Smack The Pony reunion as we finally meet Tom's ex-wife, who is played by one of Sarah Alexander's former cast mates, Doon Mackichan.

Not only does the former Mrs Tom Marshall have an ability to get up people's noses (a bit like her annoying daughter), she also turns out to have the skills of a cat burglar as she manages to enter a house without actually being let in.

But before all that, Gemma (Alexander) has to cope with another unwelcome house guest - ex-husband Jason (Neil Morrissey), who has been kipping on her sofa since splitting up with Inca.

While assisting Jason with his love life, Gemma herself is still emotionally torn between soppy Tom (Nathaniel Parker) and toyboy Billy (Robert Sheehan) and as this is the final episode of the series, we should finally find out who she's going to choose.

Will she follow her head or her heart? Go for the yurt or the Scotch egg? Don't worry, that last sentence will make sense.

Sarah Alexander interview

Me and Mrs Jones star Sarah Alexander talks 'seminal' show Smack the Pony and jumping into bed with 24-year-olds.

Sarah Alexander has revealed the hardest thing about playing a modern-day Mrs Robinson - snogging younger men. Despite the difficulties of locking lips with less mature actors, the former Coupling star is happy to play the older woman in BBC1 comedy show Me And Mrs Jones.

Sarah, 41, said: "In terms of getting older and moving on to the next stage, I am embracing it. I'm so thrilled to be a central lead in a comedy, particularly for BBC1."

But Sarah - playing Mrs Jones alongside on-screen ex-hubby Neil Morrissey and love interest Nathaniel Parker - confessed she was nervous about shooting steamy scenes with Misfits star Robert Sheehan - who is just 24. She said: "You wonder what they're thinking. You're wondering whether they're dreading it. It's an odd situation to be in."

Sarah Alexander interview

Sarah Alexander is happy to play the older woman, she tells Gerard Gilbert.