Society's expectations being what they are, most of us seem to spend those few short years as independent adults longing to become half of a couple. In some places, we spend these years living with our parents, and in others, we move out and live in sub-standard (but blessedly private) apartments or houses with our friends. It is in a block full with the latter kind of young unmarrieds that all the action in tonight's enjoyable movie Singles (Pearl, 9.30pm), takes place. The place is Seattle, and the time the last years of the 20th century and six young people are looking for something, although they aren't quite sure yet what that is. Appropriately dubbed Twentysomething by critics, this is director (and former Rolling Stone hack) Cameron Crowe's third movie, and has something of the humdrum, episodic style of the thirtysomething television series. Peter Horton (Gary the Beard) even makes a brief appearance as a video date. Matt Dillon is hilarious as a hopeless, selfish but charming musician, who is pursued by Janet (Bridget Fonda), who even considered having her breasts enlarged to attract him. Campbell Scott plays the stupidly cynical Steve who almost throws away the love of his life because he doesn't want to seem too keen and actually call her. As all the Smug Marrieds, as that shrewd social commentator Bridget Jones calls them, know however, actually getting together with someone you like and who likes you back is just the beginning. There is plenty of evidence of this in the third series of Peak Practice (STAR World, 9pm), which starts this evening. Everyone who was single in the first series now seems to be married, and, more importantly, vice versa. Jack and Beth, for example, should be celebrating their first anniversary. Instead he has taken up potholing in the name of medicine. And Will and Sarah have to meet up in his new bachelor pad to sign the divorce papers. Married life seems to have had a disastrous effect on Beth's personal style (she has horrible highlights and an unflattering page boy haircut, which I can only blame on actress Amanda Burton's desire to grow out the severe Sam Ryan crop she has in Silent Witness). Jack is hardly better, with that horrid long-at-the-back footballer haircut he had at the beginning of series one. Will and Sarah, on the other hand, have never looked better. The real horror in tonight's episode derives not from the effects of contentment on appearance, but the efforts Jack has to make to rescue a group of teenagers and their teachers, trapped in a disused mine after a rockfall. This is not recommended watching for the claustrophobic. Poor Jack spends almost the whole hour underground squeezing through very small tunnels in the pitch black, being tormented by a cocky cave rescue man who says things like, 'Doctors all think they are God, don't they?' and fighting back panic attacks.