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Yet he is now preparing to do something most actors would find daunting even with perfect recall: performing a much-loved Samuel Beckett play alone on a London stage.

Marinker, 85, is best known for his voice work: from radio plays and video games to big-budget films like Labyrinth and Paddington in Peru.

On camera he was the adviser to the US president in Love Actually and one of the airline passengers in the drama United 93.

In 2023 he was playing Gandalf in a stage version of Lord of the Rings when he felt himself "switching off" and an understudy had to take over for the rest of the run.

MRI scans and other health checks followed. Then two years ago, he was diagnosed with Alzheimer's disease.

"I just had to accept it," he says. "It explained why I kept losing things and I started laughing at myself, at all the other silly things I do again and again."

But "out of the blue" a call came in from someone Marinker had worked with closely in the past - Dave Wybrow, the director of the Cockpit Theatre in London.

The idea was to put on Krapp's Last Tape, an intense one-man play in which an ageing writer listens back to recordings of his younger self, remembering a lifetime of regrets and missed opportunities.

"It's a dynamite show and a dynamite piece of writing," says Wybrow, whose mother also lived with memory problems at the end of her life.

Rehearsals have been running since the end of June to give Marinker extra time to practise, and a whole team assembled to make the play happen.

A stage manager will stand next to the set throughout the performances, autocue screens will be dotted around the theatre, and Marinker will be wearing a tiny earpiece so he can be quickly prompted if he forgets his lines.

Wybrow is adamant this is not about "covering up" Marinker's illness, but showing that collaborative, creative work is still more than possible after a dementia diagnosis.

"Dave asked would I like to do it, and I was just 'Yes. Oh yes, yes, yes, yes!'" he says.

"I'll still get nerves [on the first night] but I know how to deal with them – that's just the adrenalin."

This is not the first time Marinker has performed the play. He first took on the same role in 1983.

The production team unearthed reel-to-reel recordings of that performance more than 40 years ago, and they will be woven into the new production as his character listens back to echoes of his younger self.

One of the striking things about Alzheimer's is that memory loss can be selective rather than uniform.

Early in the disease, regions around the hippocampus, deep within the brain's temporal lobes, are among the first to be affected.

That area plays a key role in forming and retrieving what scientists call episodic memories: memories of specific events and experiences in a person's life.

That is why people with Alzheimer's may struggle to recall a family holiday, a conversation with a friend or somebody's name, for example.

But other memories linked to highly practised skills and routines can be more resilient.

"Something stored in long-term consolidated memory is often easier to access than new memories that have just been formed," says Tara Spires-Jones, professor of neurodegeneration at the University of Edinburgh and author of Fighting for Our Minds.

That helps explain why some people with Alzheimer's can still make a cup of tea, recall song lyrics, or even perform music or a well-rehearsed theatrical script after other memories may have begun to fade.

All the profits from the four-day theatre run are going to the Alzheimer's Society, an organisation which helped Peter after his diagnosis.

Research for the charity in 2025 suggested that 42% of people living with dementia felt ashamed about their symptoms.

One in five of those with memory problems said they had not seen a doctor about a diagnosis because they were worried about the reaction of friends and family.

Stigma is "still very much prevalent", says Taiyaba Zeria, who manages dementia support services for the Alzheimer's Society in London.

"What Peter is doing really highlights that a diagnosis is not the end, and a person living with dementia can still do so many things they enjoy and they are passionate about."

Marinker, meanwhile, describes the project as his "wonderful swan song".

"I'm in the early stage [of the disease], so I need to make the best of the early stage and prepare as best I can for the middle stage," he says with a wry laugh.

"I might just live through this [performance], or I might just drop!"

The striking outfits are on display at Shambellie House - which closed as a costume museum in 2013.

A group of nurses have raised around £150,000 for local organisations through their performances.

The Baby Reindeer star says the festivals are essential for new talent, and that he owes his success to the Fringe.

The former Scarborough cinema is formally recognised as plans for a theatre revival progress.

The contractor is asking for an extra £1.5m to cover extra costs in order to finish the project.