The NHS website for booking Covid-19 vaccine appointments appeared to temporarily crash after people aged over 45 were offered jabs.
Some visitors to the site on Tuesday morning were faced with the message: “The NHS website is currently experiencing technical difficulties.
“We are working to resolve these issues. Thank you for your patience.”
Other users reported being placed in a queue, with a holding screen which read: “You are in a queue. Lots of people trying to book an appointment.”
Shortly after the vaccine booking site was hit by the technical issues, vaccines minister Nadhim Zahawi tweeted that the problem had been “fixed”.
It is understood that NHS Digital were able to get the website back up and running on Tuesday morning, with all issues being resolved and people able to book appointments.
The technical issues came as the NHS online booking system opened up to allow people over the age of 45 to arrange for their coronavirus vaccine as part of the start of “Phase 2” of the vaccination programme.
The NHS has previously been focused on ensuring vaccines are offered to those considered to most vulnerable to coronavirus – those aged over 50, people deemed be “clinically extremely vulnerable” and health and social care workers.
There are an estimated 3.7 million people in England aged 45 to 49.
According to the Government, in total almost 40 million doses of the Pfizer and AstraZeneca vaccines have been delivered since their rollout began in the UK in December, including 32 million first jabs and more than seven million second doses.