London: Ten new large-scale centres, including a rugby ground, racecourse, food court and a cathedral, will open up next week across Britain to join the seven already delivering vaccines to immunise against COVID-19, the UK's National Health Service (NHS) said on Sunday.It comes as a further 324,233 vaccine doses were administered across the UK to take the total above 3.5 million, a milestone hailed by Prime Minister Boris Johnson as a "fantastic national effort".The state-funded health service leading the UK's "biggest" vaccination programme in history also confirmed more than 1 million people aged 80 or over have been invited to book a coronavirus jab at a Vaccination Centre.There are now 1,000 general practice (GP) led services and more.