Alex Walkinshaw has admitted his first day on the set of Casualty was nerve-wracking.
The 37-year-old is making his debut as newest recruit, Nurse Adrian 'Fletch' Fletcher, in the BBC One drama.
"It's a massive show, it's been around for ages and it's an institution," he said.
"It's part of what our generation grew up watching, so it's important to treat it with the respect it deserves."
Alex, who played Insp Dale Smith in The Bill, said that, fortunately, he knew some of the cast members.
"It did take the pressure off because it meant that if I did have a panic I knew I could shoot off, find someone and say, 'I don't know what I'm doing'.
"And they'd go, 'You're right, you don't' and then I'd be all right again," he joked.
:: Alex makes his Casualty debut on BBC One on Saturday, June 30