Stripped-back 90-minute show was Spears' first British gig for five years
Event is celebrating its tenth anniversary
James Arthur is likely to be No 1 single this week
Band's second album 'Wild World' has just entered the charts at Number One
The Chainsmokers’ 'Closer' retains top spot of UK Singles Chart
Fans can visit the pop-up for free on London's Brick Lane today (September 13)
A flyer circulated online has aroused suspicions of a gig later this week
Band release second track from upcoming record 'Wild World'