The Crown newcomer Emma Corrin has received widespread praise for her portrayal of Princess Diana , but it turns out filming the show wasnt all plain-sailing.

During a new interview with Glamour , Emma revealed that she had to be hospitalised after filming one of series fours most difficult scenes on location in Spain.

Im asthmatic and I had been ill for a while with a bad cough, she told the magazine.

I had to film a scene in a freezing-cold swimming pool, with the kids playing William and Harry.

It was honestly the hardest scene to film because I was genuinely keeping myself alive treading water, and also keeping five-year-old Harry alive, as we found out he couldnt swim!