The BBC adaptation of Charles Dickens' Bleak House is poised to be snapped up by broadcasters around the globe.
Bleak House features an all-star cast
BBC Worldwide - the BBC's commercial arm - said there had been a "huge amount" of international interest.
About 20 countries are said to be keen on showing the period drama, which has been aired on BBC One in half-hour episodes with soap-style cliff-hangers.
The final episode of the 15-part series, starring Gillian Anderson and Charles Dance, will be shown on Friday.
Bleak House, which began on 27 October, has regularly attracted more than six million viewers per midweek episode.
A spokesperson for BBC Worldwide said: "We've had a huge amount of interest from broadcasters around the world.
"As it's still on air we haven't confirmed any deals, but the people who take our period dramas are saying it's the best that they have seen from the BBC."
Last month it was revealed that the period drama had helped boost sales of Dickens' books.
Online retailer Amazon.co.uk said it recorded a 290% rise in Bleak House purchases during October.
They also saw a 31% rise in sales of two other Dickens works, Oliver Twist and A Tale of Two Cities.
Meanwhile, Penguin Books has just made Dickens' classic novel A Christmas Carol, read by actor Geoffrey Palmer, available on a five instalment podcast.