Sarah-Louise Platt (also Barlow, Tilsley and Grimshaw) is a fictional character from the British ITV soap opera Coronation Street.

Sarah is the daughter of Gail (Helen Worth) and Brian Tilsley (Christopher Quinten), sister to Nick Tilsley (Warren Jackson, Adam Rickitt, Ben Price), half-sister to David Platt (Thomas Ormson, Jack P. Shepherd), granddaughter to Audrey Roberts (Sue Nicholls), Ted Page (Michael Byrne) and Bert (Peter Dudley) and Ivy Tilsley (Lynne Perrie) and mother to Bethany (Mia Cookson, Amy & Emily Walton, Lucy Fallon), Billy and Harry.

However, Sarah is unaware that Todd is struggling with his emerging homosexual feelings, and he begins an affair with Karl Foster (Chris Finch).

The police interrupt the ceremony to inform the Platt family of the attempted suicide; Sarah marries Jason regardless, knowing it is just a stunt to ruin her wedding.

Shortly afterwards, Gail's brother Stephen Reid (Todd Boyce) visits and offers David a job in Milan.

Callum later tells David and his wife and Max's mother Kylie Platt (Paula Lane) that in exchange for £20,000, he will be out of their lives forever.

When she tries to escape, he attacks and attempts to rape her, but is stopped when Kylie arrives and hits him over the head with a wrench, killing him instantly.

Todd then comes up with a plan to blame Callum's murder on Jason's deceased father Tony Stewart (Terrance Maynard).

Sarah starts a relationship with Gary Windass (Mikey North) after he helps Bethany, who is experiencing school bullying.

[13] In May 2001, it was revealed that Coronation Street would feature a storyline in which the issue of paedophiles "grooming" kids over the internet would be played out with Sarah.

The spokeswoman said they hoped to highlight the issue of internet crime, given recent publicity by the Tonight with Trevor MacDonald show and TV presenter Carol Vorderman.

The show should also prove a far more effective measure in tackling concern over internet chatrooms than either the melodramatic outpourings of celebrities or the authoritarian and legislative approach of the government.

However, while the show should do more to make kids aware of the potential dangers of chatrooms, we remain concerned that it could also be used to kick up a storm that will see unnecessary and draconian legislation pushed through on a wave of public worry.

[20] In March 2003, Polly Graham from the Sunday Mirror reported that executive producer Kieran Roberts wanted Todd to become the show's first gay character.

[22] On 22 August 2003, it was reported that Todd would befriend Sarah's brother, Nick Tilsley (Adam Rickett) and kiss him, however, he does not reciprocate.

"[28] In March 2008, it was reported that O'Brien was "seriously" considering a return to the soap just three months after leaving as she "struggled" to find acting work since an appearance in a Christmas pantomime.

[30] It was reported again in July 2009 that she was to return to the role of Sarah for an "explosive" Christmas storyline in December 2009, but O'Brien denied these rumours, saying that she was not going to make a comeback "anytime soon".

[36] Helen Worth who plays Sarah's mum Gail Platt spoke of O'Brien's return on ITV breakfast show Good Morning Britain saying: "I am absolutely delighted.

Asked how the return came about, she replied: "Well, I had been to see [Coronation Street producer] Stuart [Blackburn] and we had some chats, but then I was in the process of having a baby so it was slightly put on hold.

Speaking of the announcement, Redford said: "Until I'm actually on set, I genuinely don't think it will sink in that I'm joining the cast of Coronation Street.

Speaking of her casting, Fallon commented: "Walking onto the set was surreal and nerve wracking, but everyone has been really welcoming and I am thrilled to have been given this great opportunity."

I mean there's the element that it's David's sister and that's going to help Callum's way on the street, but she's very feisty and he needs someone to match him, and I think Sarah-Lou is the girl to do that.

[45] Sarah also later joins sides with David and Kylie following Callum threatening her and beating up her ex-husband Jason Grimshaw (Ryan Thomas).

An ongoing conversion of the garage in a bedroom extension poses a problem and they need to move quickly, but a series of events ruin their plans.

Gail then hires Jason Grimshaw (Ryan Thomas) to cover the manhole up with concrete, unaware Callum is concealed inside.

The scene featured Carla Connor (Alison King) causing a car accident, colliding with Tyrone Dobbs' (Alan Halsall) truck which crashes into the Platts' home.

[50] On 15 October 2015, it was reported that there would be a shock twist in the recent Callum murder storyline with Sarah finding out she is pregnant with his baby.

The decision threatens to tear the Platt family apart as they are already struggling to cope with keeping Callum's death a secret and now have this bombshell.

O'Brien responded to the criticisms that Coronation Street has been copying EastEnders with soap fans noting the similarities to Stacey Branning's (Lacey Turner) postpartum psychosis storyline.

[54] Sarah's underage pregnancy storyline was praised by the UK government, when public health minister Yvette Cooper said the show should be applauded for raising the issue in front of a mass audience.