The demand for tickets to see the reunited Oasis could “absolutely dwarf” Taylor Swift’s Eras shows, music industry experts predict.

The legendary Britpop group confirmed late on Monday (British time) – after days of rumours – that it will reunite for live shows in Britain and Ireland in 2025.

“This is it, this is happening,” a post accompanying a video on the band’s Instagram told its 2.9 million followers.

The band’s first official gigs are in Cardiff on July 4 and 5 next year. However, it is still a strong, albeit unconfirmed, contender to play at Britain’s Glastonbury Festival a week earlier.

DJ Kevin McManus has suggested demand for tickets will outstrip Swift’s recent gigs in the UK.

“I think people forget but the two Knebworth [Festival in 1996] shows they did, almost 4 per cent of the population tried to get tickets,” he told ITV.

“They sold out 250,000 tickets, but it was a ridiculous amount of people who tried to buy tickets, they were that huge.

“But this, because people have been talking about it for the past decade, it’s going to be even bigger.”

McManus said he thought “everybody” would try to get a ticket to one of shows by brothers Liam and Noel Gallagher.

“Taylor Swift was obviously the big deal this summer, I think it’s going to absolutely dwarf that, just because it’s them and there’s that talk,” he said.

“There’s always going to be that ‘are they going to do it? Are they going to fall out before the first show, are they going to fall out after five shows? Will they do the rest?’

“There’s always going to be that air of jeopardy.”

The Gallagher brothers have a famously tempestuous relationship. Oasis finally broke up in 2009 after a backstage fight in Paris between the brothers, involving smashed guitars.

Professor Jonathan Shalit, the chairman of talent agency InterTalent, recently claimed that Oasis could make “over £400 million ($A780 million)” from their reunion.

“With tickets, sponsorship, merchandise and filming, I would predict an income for Noel and Liam of over £50 million ($A97 million) each,” he told Britain’s Sun newspaper.

Shalit observed that the 2025 tour – which will include gigs in London, Manchester, Cardiff, Edinburgh and Dublin – will be worth an eye-watering amount of money for the band.

“This is a tour that could easily gross over £400 million ($A780 million),” he said.

Among Oasis’s dates for next year are four at London’s Wembley Stadium.

Swift recently wrapped up the last of eight at the stadium for her Eras Tour. In doing so, she became the world’s first solo artist to play the London venue that many times.

-with AAP