Alison Steadman was issued a stern warning before her appearance on This Morning on Friday.

The advice came from the actress’s Gavin and Stacey co-star before she was grilled on the breakfast show.

The star told Alison, who will reprise her role as Pamela Shipman in the last-ever episode of the BBC sitcom to be careful what she said.

They warned her not to reveal any information ahead of a secret Gavin and Stacey Christmas special screening.

Larry Lamb took to This Morning ahead of his own appearance on Good Morning Britain on Thursday to warn his on-screen wife Alison to beware of presenters Alison Hammond and Dermot O’Leary.

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Alison Steadman was issued with a stern warning not to spill any Gavin and Stacy secrets before her appearance on This Morning on Friday

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The star told Alison, who will reprise her role as Pamela Shipman in the last-ever episode of the BBC sitcom to be careful

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The advice came from the actress’s Gavin and Stacey co-star and on-screen husband Larry Lamb before she was grilled on the breakfast show

And the actress heeded Larry’s suggestion and was tight-lipped throughout the interview about any details of the long-awaited special.

During the show, the Hold The Sunset star discussed getting into drama school, filming Gavin and Stacey for the final time and whether she would be watching the Christmas finale.

Alison told the hosts that she had loved every minute of filming.

She said: ‘[It was] so emotional because we all love filming it so much and we had a great time being back together, and that final wrap…’

She added that the show had been a big part of her life and she would miss it dearly.

She also described the fan chaos as they filmed in South Wales.

The star told Alison and Dermot that hundreds of fans gathered at the filming locations to catch a glimpse of the cast in character.

‘They’re cordoned off but there’s loads of them, hundreds’ she added.

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And the actress heeded Larry’s suggestion and was tight-lipped throughout the interview about any details of the long-awaited special

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Alison told the hosts that she had loved every minute of filming. She said: ‘We all loved it so much and we had a great time being back together, well.’

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The actress confirmed she would be watching the special on Christmas day, revealing she hadn’t seen it yet because they only finished filing on Monday

This Morning’s Alison then asked the Shirley Valentine actress whether she was ready for the popularity of the BBC sitcom when it first came out.

Alison confessed: ‘Well I knew when I first read the script it was really good, I just knew it was tops but you can’t anticipate it’s going to be as popular as it is.

‘But gradually as things were moving along, I thought “this is really going places”‘.

And the star proved that the show is just as popular in her home as it is with the rest of the UK.

She confirmed she would be watching the special on Christmas day, revealing she hadn’t seen it yet because they only finished filming on Monday.

She then let slip that there would be a cast and crew screening for everyone to watch it together.

Alison’s appearance comes as Larry revealed some details about the lavish wrap party for the end of Gavin and Stacey filming was so riotous it made him ill, as he appeared on TV with a ‘tickly’ throat.

The ex-EastEnders star said: ‘Well they did have a big party and James and Ruth really pushed the boat out. It was a wonderful party.’

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Alison’s appearance comes as Larry revealed some details about the lavish wrap party for the end of Gavin and Stacey filming on Good Morning Britain on Thursday

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The actor will reprise his role as Mick Shipman alongside Alison and Matthw Horne (pictured0

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Gavin and Stacey co-creators James and Ruth shocked the nation earlier this year by revealing the programme is to return for a finale, which will be the first episode since a 2019 Christmas special

Larry Lamb admits to losing voice because of Gavin and Stacey party

Larry said filming the finale was ‘so emotional’ as he teased a ‘beautiful’ ending to the series.

He admitted the process was even more poignant than usual because they shot the final scenes on the last days of filming.

He said: ‘It was a trip down memory lane. Because suddenly there we are, and we’re facing the fact that effectively this is the end of this adventure – it’s the end of this journey and it was so emotional.

‘On the last day of filming, we were filming the end of the story which is so unusual because nine times out of ten you find that you’re doing the end on the first day and you’re doing the beginning right at the end of it all.

‘So what we were filming was the end of the story on the very last day and there was just this mental tick, tick, tick going on all the time and the emotions just kept building and building and building … [the ending] is just beautiful.’

Gavin and Stacey co-creators James and Ruth shocked the nation earlier this year by revealing the programme is to return for a finale, which will be the first episode since a 2019 Christmas special.

While the upcoming Christmas special has been widely billed as the last-ever episode, Larry admitted he would be up for starring in another episode.