Graham Norton is releasing a red wine to join the Sauvignon Blanc he launched last year; this follows last week’s news that production would be ramped up by 50% for his 2016 white wines in order to meet soaring demand.

The Irish talk show host teamed up with New Zealand’s Invivo Wines in 2014 and has since sold more than 500,000 bottles of the 2015 Graham Norton’s Own Sauvignon Blanc by Invivo in Ireland, the UK, Australia and New Zealand since its release in October.

The inaugural Graham Norton’s Own 2015 Shiraz will be released this October and is a blend of grapes from South Australian regions Barossa Valley, McLaren Vale and Langhorne Creek.

Invivo co-founder and marketing director Tim Lightbourne said: “We considered doing a Pinot Noir but a lot of our customers were after a heavier type of red and we also needed the volume to support that so we looked to South Australia.

“We asked Graham if he would be keen to make a South Australian Shiraz, which he was really excited by, so we took six or seven samples from across South Australia and he chose his favourite blend.

“It wasn’t a hard sell for Graham, he knows the area and he was definitely keen.”

The success of his white wine has also led to the release of GN Sauvignon Blanc 2016. For the 2016 variant production has been scaled-up by 50% in order to meet demand for this wine, which is comprised of a blend of six wines from across the Marlborough region.

Lightbourne said Norton’s knowledge of wine was one of the keys to the success of his wine label.

“He’s actively involved, he signs off the blends, he’s really interested in this and there’s a bit more authenticity than just putting his name on the label,” he said.

Norton described his 2016 Sauvignon Blanc as “easy drinking”.

He said: “It’s got all the grassiness and zest you would expect from a new world Sauvignon Blanc but I like to think it has a bit of an old world finish – oh, and it’s affordable.”

In the UK the wine is available exclusively through Majestic stores, priced at £10.99.