NHS England’s coronavirus vaccine website crashed this morning after people aged over 56 were told to book a jab.
The outage appears to have only lasted a short time but could be a sign of things to come as the roll-out progresses into younger age groups.
Letters to 850,000 people aged 56 to 59 began landing on doorsteps from yesterday with another 850k due to land tomorrow.
The latest invites have been sent after more than eight in 10 people aged 65 to 69 took up the offer of a jab.
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NHS staff have vaccinated more than 18 million people across England, meaning more than one third of the adult population, have already received the life-saving jab.
Dr Nikki Kanani, NHS national medical director for primary care and a GP, last week: “The NHS vaccine programme is committed to protecting the country against coronavirus and it is testament to our incredible staff that we can now move on to the next age group.
“We must not forget that our success in vaccinating more than 18 million people is down to careful planning and the hard work of those staff.
“The vaccines are both safe and effective, so if anybody who is eligible but hasn’t been vaccinated yet, I’d urge them to go online or call 119 and get themselves booked in.”
People receiving the letters are invited to go online to the national booking service to arrange a jab at a time and location that is convenient for them or call 119 free of charge.
Across the whole of the UK, more than a million people have received both doses of a Covid-19 vaccine, while almost 21.4 million people have had one dose.
NHS England has said vaccinations are being given at more than 1,600 sites, with everyone within 10 miles of at least one.