The Great British Bake Off, Channel 4, 8pm

IT is semi-final week for the remaining contestants, who know they are just three patisserie challenges away from the biggest day in their baking lives. First comes the signature and a deceptively simple challenge, with Prue Leith and Paul Hollywood looking for perfection, followed by Prue’s complex, multi-layered technical. The pressure intensifies when they are asked to create a spectacular showstopper that could grace a Parisian patisserie – but who has the skill to reach the final and who will fall at the last hurdle?

Martin Lewis: Ten Things Your Kids Should Know, STV, 9pm

IN this one-off special, the money expert reveals what he believes every family should do to help secure their children’s financial futures, offering handy tips for those concerned about their state of affairs. The film also explores some of the secrets of Martin’s own success to give a picture of how he came to prominence in his field and made his fame and fortune, and looks back at his childhood and how the tragic death of his mother shaped his life.

Informer, BBC1, 9pm

A NERVOUS Raza struggles with his new role as an informant for CTSU as he befriends and spends time with the unpredictable Dadir and his Bridge Town Crew. Gabe and Holly discover Yousef has been murdered – could Big Shot the London contact linked to El Adoua be behind it? The pressure on CTSU to find out whether a London attack is planned mounts and Gabe pushes Raza further to find Big Shot, but instead of invading Dadir’s life, Raza finds Dadir invading his.

Inside the Tower of London, C5, 9.15pm

IT’S more than a decade since the Tower of London last opened its doors to TV cameras, so this four-parter promises to give a glimpse at one of the world’s best loved historical sites, a landmark filled with 900 years of mysteries and secrets. Cameras follow the staff as they cope with three million visitors a year and keep the Tower running 24/7.