BBC experts are to look again at sound qualities on the hit TV drama Happy Valley.

They have responded to numerous complaints over the sound with many viewers claiming the actors seem to be “mumbling”.

Earlier this week, the BBC insisted the sound quality was fine and suggested hearing problems were because of the Yorkshire dialects used in the production. That was a view which did not go down well with people in Huddersfield.

But now they are to carry out further checks.

Producers of the new series of Happy Valley have revealed they are ‘reviewing’ sound complaints that have overshadowed the opening two episodes.

Viewers flooded social media with claims that they were forced to turn on their subtitles or turn up the volume on their TV to be able to understand the dialogue, especially from its leading actress Sarah Lancashire.

Other also claimed the sound issues had become so bad, they had decided not to tune in to any further episodes of the drama.

Addressing the controversy on BBC Breakfast, one of the show’s producers said: “We are reviewing, of course we are reviewing. We are taking it seriously.

“We want people to enjoy the drama so we are going through the checks, and watching again - we always listen to the final edit on domestic speakers.

READ MORE: Happy Valley: 10 things we learned from episode one

READ MORE: Happy Valley: 10 things we learned from episode two

“Independent people are watching again, and we are ensuring we are doing all we can.

“Nothing has changed from the last series. The dubbing mixing is the same and many of the actors haven’t changed.

“We are slightly mystified but we are working on it.”

Following the interview, fans of the Yorkshire-based drama accused the producer of being ‘patronising’.

Even former BBC and Krypton Factor presenter Gordon Burns waded in on the argument, slamming the BBC for ‘missing the point’.