Statistics reveal that modern women tend to marry their 11th sexual partner when they are about 28 years old. Sarah "Saz" Paley (Michelle Ryan) is an improbably glamorous maths teacher who from childhood has sought to impose numerical order on the world about her, and so here she is, aged 28, marching down the aisle with her "Mister 11" (Sean Maguire). But Mister Nine (Adam Garcia) turns up at the reception to reveal that after they met at a nightclub years before, Saz and he had both been too drunk to sleep with one another, and so now Mr Nine is Mister Not Quite, Mr 11 is demoted to Mr 10 and Saz's world promptly falls apart. This is obviously a ludicrously slight premise, but thanks to a sharp script and fine acting, this two-part romantic comedy turns out to be a delight.

Remember that scene in Four Weddings And A Funeral when Andie MacDowell lists her sexual partners to a beleaguered Hugh Grant? Well, this is sort of that, stretched out over two parts. This time, our leading lady is Michelle Ryan playing a statistics-obsessed maths teacher who reckons the 11th sexual partner is the one you should marry - the appearance of an ex on her wedding day prompts a romp through her hot-under-the-collar past. It's not entirely successful because Ryan's not much of an actress and the script is a bit lacklustre. But the eye-candy credentials of Sean Maguire and Adam Garcia, and an appearance by sweet Slumdog Millionaire star Dev Patel are enough to keep you paying attention.