Plus One is a British television comedy drama that aired on Channel 4 in 2009. The series stars the versatile actor Daniel Mays as Rob Black, the unfortunate fellow who always seems to find himself in the most awkward of situations. The show is set in London, providing a realistic backdrop for the hilarity that ensues.

Comically weaving the personal life of the show's protagonist with pop culture references and British humor, Plus One provides a light-hearted, humorous take on relationships, dating, and dealing with exes. The concept of the show is uniquely relatable and fascinating, presenting a scenario that many can identify with – the one where your ex moves on to someone seemingly better than you. Only in Rob’s case, this 'someone' is none other than Duncan from Blue, a famous boyband in the UK (played by himself, Duncan James).

Rob’s character is both likeable and relatable. Although his methods to reform his life and topple his ex's new relationship may be questionable, they make sense within the comedic logic of the show. His determination to prove that he is not defeated despite his ex-girlfriend Linsey's very public upgrade and his inability to move on because he is still in love, forms the basis for the series.

Daniel Mays delivers an exceptional performance, revealing Rob's weaknesses and strengths in an endearing way. His comedic timing and engaging screen presence breathe life into the character. He is supported by a talented cast, including Miranda Raison as Linsey, his ex-girlfriend, and Duncan James, playing a version of himself. There are also guest appearances by several known television personalities playing themselves, which only adds to the realistic but humorous nature of the show.

The narrative of Plus One revolves around Rob's attempts to show up his ex-girlfriend at her wedding, presenting a plus one who is equal to – if not better than - her popstar fiancé. The episodic stories follow Rob's various mishaps and efforts to secure an impressive plus one. With this underlying plotline, the show delivers a mix of situational comedy, embarrassing situations, romantic entanglements, and oddball humor.

The writers of Plus One, Tim Allsop and Stewart Williams, have crafted a comedy that is both smart and funny, blending in pop culture references with everyday dilemmas seamlessly. The rewarding aspect of Plus One is that while it does deliver the laughs, it also subtly explores the theme of heartbreak, the devastating aftermath, and the road to recovery.

Moreover, the dialogue is quick and witty, and the episodes are fast-paced, which renders all the five episodes in the one series enjoyable and easy to watch. With clever writing, committed performances, and an intriguing premise, Plus One is both an entertaining and rewarding watch for those who enjoy British comedy with a touch of the real world.

The series is directed by Sarah O'Gorman, who brings out the humor and wit in the scripts with skill and finesse. She ensures the comedy is balanced with real emotion, and the characters are authentic and relatable. Plus One is a perfect example of less is more, with each episode being slightly less than half an hour.

The production design is realistic and understated, but very much in keeping with the show's tone and setting. The infusion of a few elements of British pop culture further adds to the charm and authenticity of the creation, making it a delightful watch.

In conclusion, Plus One is a well-written British comedy series that explores relationships, heartbreak, and one man's slightly misguided attempts to reclaim his self-worth. With its array of memorable characters, smart humor, and entertaining plot, it is a delightful addition to the genre. Daniel Mays shines in the lead role, bringing a unique blend of humor and heart to the screen. Whether you are a fan of British comedy or looking for a show that delivers laughs with a dose of reality, Plus One is well worth a watch.