THE MASKED SINGER Seven Days

SATURDAY

7pm, itv HHHH Completely deranged or totally inspired? Whatever your opinion of the singing competition, it’s certainly got the nation talking. In the fourth heat, the elaborately disguised celebrities take to the stage before the losing act has their identity revealed.

POINTLESS CELEBRITIES

7.40pm, bbc1 HHHH

The contestants are all comedians in this week’s edition, with Sofie Hagen, Jenny Eclair, Cariad Lloyd, Darren Harriott, Nish Kumar and Ed Gamble among the teams.

BONE DETECTIVES: BRITAIN’S BURIED SECRETS

8pm, ch4 HHH

Tori Herridge and her team explore the terrible lives of youngsters during the Industrial Revolution after archaeologists discover the remains of teenagers and children beneath a shopping arcade in Leeds.

TONY ROBINSON’S HISTORY OF BRITAIN

8pm, ch5 HHHH

This look at ordinary lives in times past reaches the Georgian era, where Tony ‘meets’ Jack Rann, a coach driver turned highwayman, and Elizabeth Bowman, who made gin and then sold it at public hangings.

HOW THE VICTORIANS BUILT BRITAIN

9pm, ch5 HHH

Michael Buerk turns his attention to bridges this week, beginning in Shropshire with the Iron Bridge; then, he moves on to Bristol’s Clifton Suspension Bridge, Scotland’s tragic Tay Bridge and formidable Forth Bridge, and ends with London’s iconic Tower Bridge.

CASUALTY

9.20pm, bbc1 HHH Tensions spill over in A&E when a group of injured environmental activists are admitted, while Charlie has an awkward meeting with an old friend of Duffy’s.

SUNDAY COUNTRYFILE

6.10pm, bbc1 HHHH

The team are in Ballycastle, in the far north of Northern Ireland, where Joe Crowley meets a couple who produce smoked salmon, Margherita Taylor visits an ethical farm, and Charlotte Smith goes on a red squirrel safari.

THE GREAT POTTERY THROW DOWN

7pm, ch4 HHH

In part two of the new series, the potters must each craft a 32-piece chess set, weighing their artistic ambition against the sheer lack of time – and one set provokes tears from judge Keith Brymer Jones. Episode three can be seen on Wednesday on More4 at 9pm.

DOCTOR WHO

7.10pm, bbc1 HHH

The Doctor and co land at the edge of Niagara Falls at the turn of the 20th century. There, the inventor Nikola Tesla (played by

ER’S Goran Visnjic) is facing a threat from Mars, and he could do with some help.

CALL THE MIDWIFE

8pm, bbc1 HHHH When a ward Sister at St Cuthbert’s falls ill, Lucille is sent to help out – and, while caring for a mum-to-be, encounters hostility that feels a lot like racism. Meanwhile, fundraising for the incubator has stalled – what better way to raise money than a fashion show?

VERA

8.10pm, itv HHHH

In Parent Not Expected, Vera (Brenda Blethyn) investigates the murder of a young man who was adopted as a child and had recently traced his birth father. Could longburied secrets be to blame for his death?

SAS: WHO DARES WINS

9pm, ch4 HHH

This week, the 18 remaining recruits are split into two teams and must each face three brutal challenges, including an intense close-combat task called murderball. Eek!

MONDAY WILD ANIMAL RESCUE

7pm, ch5 HHHH

Over the next four nights, Steve Backshall, Miranda Krestovnikoff, Bill Oddie and Lindsey Chapman will be celebrating Britain’s incredible range of wildlife – and revealing the steps we can take to protect it.

HOW TO LOSE WEIGHT WELL

8pm, ch4 HHH

Dr Xand van Tulleken investigates whether hormone injections could be the miracle flab jab we have all been waiting for, while Dr Helen Lawal discovers if it is possible to sit down and still burn calories.

SILENT WITNESS

9pm, bbc1 HHH

We learn more about Nikki this week when she performs a difficult postmortem on a woman whose body is found on train tracks in London. The victim’s recent and historic injuries point to domestic violence, and bring back troubling memories of Nikki’s childhood.

COLD FEET

9pm, itv HHHH

Adam and Karen’s new living arrangements cause chaos for their families, while

David embraces his new role – but faces humiliation from a former adversary.

999: WHAT’S YOUR EMERGENCY?

9pm, ch4 HHHH

Returning for a new run comes the fly-on-the-wall series that takes a frank and candid look at what it takes to try to maintain the rule of law and order in the UK.

DIAMOND DEALERS AND COCKNEY GEEZERS

10pm, ch4 HHH

This one-off documentary goes behind the scenes at Trotters Jewellers in Bethnal Green to meet some of the colourful characters who frequent this gem of a shop.

TUESDAY DOGS BEHAVING (VERY) BADLY

8pm, ch5 HHH

This week, master dog trainer Graeme Hall comes to the aid of Hannah and Jake, a young couple who are being held hostage in their home by their French bulldog, Maverick.

24 HOURS IN A&E

9pm, ch4 HHHH

A motorcyclist who hit a lamppost at high speed and a two-year-old boy who has fallen and banged his head on concrete are among the patients heading to St George’s.

BEN FOGLE: NEW LIVES IN THE WILD

9pm, ch5 HHH

On a river on New Zealand’s North Island,

Lucy lives with husband Tim and their two daughters. They traded a comfortable life in London for a 25-acre farm in the forest; here, Ben hears about their good life down under.

LOSING IT: OUR MENTAL HEALTH EMERGENCY

10pm, ch4 HHH

In a disturbing new series, Nottinghamshire Healthcare NHS Foundation Trust opens its doors to the TV cameras to reveal the full extent of the nation’s mental health crisis.

WEDNESDAY TRUST ME, I’M A DOCTOR

8pm, bbc2 HHH

Michael Mosley finds out what effect your diet can have on your mental health; Guddi