Glenda Shuttleworth (Jodie Prenger) was left heartbroken in tonight’s (Wednesday, June 3) Coronation Street after a conversation with Debbie Webster (Sue Devaney).

Glenda and Debbie have developed a lovely friendship since putting together their dementia choir last year. It has been a huge success, despite their occasional clashes over creative direction.

The choir even sang at Debbie’s wedding to Ronnie Bailey (Vinta Morgan) earlier this year – with Debbie as the featured soloist, of course.

However, it’s clear that Debbie has been thinking about the future, and tonight she asked Glenda for a huge favour.

Viewers will know that Debbie was diagnosed with young-onset dementia last year, and the news came as a major shock. She had gone to the doctor about some worrying symptoms, and learnt that she’d suffered several mini strokes, known as TIAs.

After further tests, she received the dementia diagnosis and eventually confided in her family.

Since then, Debbie has been coming to terms with her condition and has been making arrangements for the future.

While sharing drinks at the Chariot Square Hotel, Glenda had Debbie in stitches, recounting a tale from her time performing on cruise ships. With their spirits high, Debbie took the opportunity to ask Glenda to take control of the reins of the choir when the time came.

Though she made light of the request, Glenda was clearly honoured and promised she would step in when things became too much for Debbie to handle.

Glenda made it clear she didn’t want to think about a future without Debbie, but the extent of the deterioration in her condition soon became apparent.

Just minutes after making the heartfelt request, Debbie asked Glenda once again if she’d be willing to take over the choir.

She hid it well, but Glenda was clearly heartbroken to witness the effects of Debbie’s dementia first-hand.

This isn’t the first time viewers have seen how Debbie’s dementia affects her.

During her time in prison for dangerous driving, after Carl Webster (Jonathan Howard) set her up for the Corriedale pile-up, Debbie experienced confusion when she suddenly forgot where she was going.

We’ve also seen her refer to photos hidden in a cupboard to remind her of her loved ones’ names and birthdays, as well as injure herself on hot plates at the Chariot Square.