8pm, Gossip Girl, ITV2
The Waldorf-Rose house is celebrating Seder when things get complicated between Blair and Nate. Elsewhere, Serena returns from Spain, and Dan takes up a catering job to earn money for college.

9pm, Eleventh Hour, Living
A millionaire dies from a heart attack, but his post mortem reveals the presence of two separate hearts, prompting Jacob to investigate. Could he be a Time Lord from Gallifrey? Probably not.

10pm, The Unit, Virgin 1
The Unit tests new member Sam McBride – but it goes wrong, which sidelines the team just as Hector’s killer is found. On the home front, Betsy has to lie to protect the Unit and the military.

10pm, Life, ITV3
In a stunning, well-written episode, Crews and Reese get sleuthing when a student acting as a prison guard in a university social experiment is murdered.

10pm, Ugly Betty, Channel 4 & HD
NEW SERIES The best comedy drama on telly is finally back. Betty’s got rid of Henry (he’s off fishing on Harper’s Island) and Gio, and now wants to concentrate on her career. Unfortunately, Wilhelmina’s in charge of Mode and Daniel’s heading up a smutty lad’s mag. What’s a girl going to do? New episodes of the series will be shown first on E4 from next Tuesday. Here’s the cast singing that old classic, New York, New York…