Taylor Swift's Eras tour was welcomed by a sparkling London Tube map redesigned in the singer's honour on Friday, as the British capital eyes a 300 million pound ($379 million) windfall.

Swift is due to perform eight shows at London's Wembley stadium, with the first scheduled for Friday, attracting nearly 700,000 fans in total, the mayor's office said in a statement.

Aside from spending on tickets and travel, her fans, known as 'Swifties,' splash out on glittery outfits and accessories to depict different musical eras of the 34-year-old's discography.

Swift's billion-dollar tour has helped local economies since its U.S. start last year, although economists are generally skeptical that concert tours or big sporting events give more than a small boost to a country's economy.

Transport for London published a special version of its distinctive London Underground map to mark the occasion.

"Taylor’s Version" of the map, a nod to her decision re-record some of her work after losing control of the master recordings, replaced names of train stops with her song titles, with "Westminster" renamed "Gorgeous" and "Piccadilly Circus" becoming "Wildest Dreams".

The star herself has spent time in the city in the past when she was dating British actor Joe Alwyn, even namechecking popular London spots in her music.

London's mayor Sadiq Khan posted a picture of himself on X, standing outside Wembley stadium revealing a mural of Swift's face capturing the singer's blue eyes and signature red lips.

The royal family even got in on the act, releasing a video on social media of the traditional 'Changing of the Guard' ceremony at Buckingham Palace playing one of her songs with the caption: "Can't stop, won't stop groovin'".

Khan's office said Swift's concerts would generate 300 million pounds for London's economy - an estimate based on average tourist spending, and one which assumed almost none of the concert-goers were from the capital.

However, this total overstates the boost that Swift's concerts provide to Britain's overall economy, as most fans would have spent the money on other goods and services - if not this month, then sooner or later.