Daniel Radcliffe and Jon Hamm share a bath in A Young Doctor's Notebook

The Harry Potter actor plays the younger incarnation of Hamm's character, Dr Vladimir Bomgard, in the comedy drama, which is based on the short stories of writer Mikhail Bulgakov.

And he admitted that the bath scene had been fun to film, saying: 'It was great, because you know you are the envy of every woman ever.'

A Young Doctor's Notebook recounts Bulgakov's semi-autobiographical experiences working in a small Russian village in 1917, as the revolution threatened to rear its head.

Radcliffe said it had been a dream to work on the project, given his love of the source material.

Despite being different incarnations of the same character, the pair still manage to share a bath (Picture: Sky)

'I have been an obsessive Bulgakov reader for a couple of years now so when the opportunity to become involved in this project came up, I could barely contain my excitement,' he said.

'The book is funny, grotesque and heartfelt in equal measure and I look forward to working with a great group of people to help bring it to life.'

The series has been made in association with Point West Pictures, the production company owned by Hamm and his partner Jennifer Westfeldt.

The series, set in early 20th Century Russia, will be screened on Sky Arts next month (Picture: Sky)

'I am thrilled to get the opportunity to work on such rich source material with such fantastically talented people whose work I greatly respect,' Hamm said, 'and to continue the relationship with Sky who have taken such good care of Mad Men since acquiring it.'

And speaking of his o! wn role in the show, he joked: 'Also, I have been watching Bridget Jones's Diary on infinite loop, and I think I've finally got this accent thing sorted.'

A Young Doctor's Notebook will be screened on Sky Arts HD next month.