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The friendship between crime-fighting pair Geordie and Sidney has undoubtedly been a huge part of the show’s success. Was Green worried about what it would be like without Norton by his side?

“I think everybody was, deep down,” he admits. “But I was fortunate enough to do the chemistry reads with the actors who were going to replace James, way before the show was even starting filming.

“As soon as Tom came in, it was immediate. We just went, ‘Oh, that’s him. That’s the guy’.”

season, marking the RAF’s 100th anniversary. There’s also a look at some of the challenges the Arrows face, whether it’s maintaining the planes, learning potentially lethal aerobatics or dealing with unpredictable weather.

Grantchester starring (from left to right) James Norton as Sidney Chambers, Robson Green as Geordie Keating and Tom Brittney as the Rev Will Davenport