Teachers(2003)

Series 3

With Simon gone, Brian and Kurt turn to his replacement for advice—the suave and morally-flexible Matt. But married Matt is much more interested in his own affairs, and it falls upon new biology teacher Lindsay to help them out. Lindsay’s funny, frank, down-to-earth and, most importantly, she’s fat—an essential safety feature for an agony aunt that ensures Brian and Kurt won’t end up fancying her. Probably.