Also, u/c London stadia (the city is now record breaking at over 1 million stadia capacity). These will be added on top:
Tottenham Hotspur, 62,000
Emirates Stadium increasing to 61,000
http://hendriksvisitedstadiums.com
New Stamford Bridge - increase to 60,000 currently on hold for the next year (the billionaire owner got pissed that he didn't get his UK visa allowed)
www.standard.co.uk
www.designbuild-network.com
Twickenham East Stand development (82,000)
https://nflfan.uk
Selhurst Park ^34,000
www.cpfc.co.uk
Lords' Panstadia development - ^30,000
www.psam.uk.com
www.psam.uk.com
Griffin Park ^20,000
https://e1.365dm.com
No1 Court, Wimbledon and its new retractable roof - 12,400