Douglas Adams's fictional detective has already been portrayed on Radio 4 in Dirk Gently's Holistic Detective Agency and now in an adaptation by Howard Overman makes an amusingly inventive, if small-scale, transition to TV. Stephen Mangan plays the shambling, penniless sleuth who believes in the "fundamental interconnectedness of things" and possesses an unerring knack of stumbling to the right conclusion. In tonight's case, he is exercised by a lost cat, a missing inventor and an exploding warehouse. Events bring him into contact with two former university friends, the gullible MacDuff (Darren Boyd) and his girlfriend Susan (Helen Baxendale).

Douglas Adams always believed that Dirk Gently's Holistic Detective Agency would make a better film than his more celebrated novel, The Hitchhiker's Guide to the Galaxy - although we can only wonder if the hugely talented, fitfully productive writer, who died in 2001 aged 49, would admire the concision of this one-hour adaptation. They've even lopped three words from the book's title. Running his Holistic Detective Agency, based on "the fundamental interconnectedness of all things", Dirk is broke and hopelessly chaotic. Stephen Mangan (Green Wing) is a spot-on Dirk, ably assisted by Helen Baxendale and Darren Boyd as sidekicks MacDuff and Susan. The plot builds to flights of fantasy from a simple case of a missing cat owned by pensioner Ruth, played by Doreen Mantle. From One Foot in the Grave's Mrs Warboys to Mrs Fishwick currently in Corrie, she's the connoisseur's vague old dear with impeccable comic timing.

Dirk Gently interview

As the BBC prepares to air its adaptation of Douglas Adams' Dirk Gently, here is an interview with Stephen Mangan, Helen Baxendale, Darren Boyd, and producer Chris Carey.

Helen Baxendale interview

After years in the making, actress Helen Baxendale has launched the new film which she co-produced with her partner David Williams.

Video: Polar bears in sub-zero comedy

Helen Baxendale and Stephen Mangan star in the low budget comedy, 'Beyond The Pole'. The film was shot in -30 degrees centigrade in northern Greenland and a rifle had to be kept on set to fend off polar bears.

'Beyond The Pole' is showing at the ICA from Friday until February 28, and at selected independent cinemas nationwide from March.

Helen Baxendale on filming Beyond the Pole

The Friends and Cold Feet actress has produced a film about a duo, starring Stephen Mangan, on mission to the North Pole.

Mutual Friends started with a suicide but ended with a fire engine. Carl's suicide was the writers' device with which to bring together his surviving friends, Martin, played by Marc Warren, and Patrick (Alexander Armstrong). Martin was the worrying type and he had loads to worry about: not only was he about to lose his job as a solicitor but his wife, Jen (Keeley Hawes), announced that she had slept with Carl and that their marriage was in trouble (all Martin's fault).

Patrick also had his problems: a personal financial crisis had got his E-Type Jag repossessed and one of his business partners was edging him out of his own Boden-style catalogue company while edging himself into his former girlfriend's knickers. The worrying thing about Patrick, buoyed along by ego and testosterone, was his inability to worry. Yet this follicly challenged Lothario was not, it transpired, irredeemably self-centred. It was he, after all, who was responsible for the fire engine's comical appearance - called not to hose a conflagration but to fulfil Martin's disgruntled young son's ambition to ride on one.

Warren, Armstrong and Hawes are watchable actors but you couldn't help but wish their parts had been occupied by Jimmy Nesbitt, Robert Bathurst and Helen Baxendale and that, as in Cold Feet, there had been room for a genuinely funny subplot (as regularly supplied by the actors Fay Ripley and John Thomson). Nor could you fail to spot how inspiration was running out even as early as episode one. Martin, for instance, kept being overheard saying things that he shouldn't by the people he was badmouthing. Only once could you accuse the programme of inventiveness and that was in the character of Carl's widow Leigh, played with cheerful understatement by Claire Rushbrook, who had clearly lost her how-to-grieve manual and went round saying how 'cross' she was with him.

My hunch is that Mutual Friends will keep its audience, not least because it is unusual in putting at its centre male rather than female friendships. But how, even as I watched its titles (as ripped off from Mad Men), I wished for more subtlety, more black humour, more depth of emotion!