What IS holding up Britain's great Covid vaccination push?

What are the factors that could hold up Britain’s great Covid vaccination push? No10 blames manufacturing constraints while Sadiq Khan blames simple formula for London’s ‘unfair’ supply

  • There is less than a month to go until No10’s February 15 vaccine target expires
  • In order to meet the lockdown-easing goal, the UK must average 350,000 a day
  • Fewer than 210,000 vaccines were administered on Monday, figures revealed
  • But yesterday’s figure — reported today — is above 300,000 in England alone

Fears Britain’s great Covid vaccination rollout had stagnated were sparked yesterday after official data revealed the number of doses dished out had fallen for three days in a row.   

And with less than month to go until Number 10’s target of vaccinating 14million of the most vulnerable people expires, pressure is growing on officials to pick up pace. 

In order to meet the lockdown-easing goal, the UK must average more than 350,000 doses a day from now until February 15. 

Fewer than 210,000 vaccines were administered on Monday but yesterday’s figure — which is reported today — is above 300,000 in England alone. Department of Health bosses will provide a UK-wide vaccine update later this afternoon. 

Government sources say there are ‘a lot of moving parts’ which contributed to the slowdown, including constraints on supply, staffing shortages within the NHS and difficulties contacting the remaining over-80s and covering care homes among the factors.   

Here, MailOnline delves into some of the factors that could be hampering the roll-out.


Pfizer — the manufacturer of one of the three Covid vaccines approved in the UK — has warned supplies would be dented this month and the next.

The drug giant is revamping its factory in the Belgian town of Puurs to allow it to pump out up to 38million doses each week. Currently it can manufacture 25million shots each week.

The American firm last Friday warned Britain to expect delays this month and into next month while upgrades were made at its factory, which supplies doses to all of Europe.

Norway was told it would receive 17 per cent fewer doses (36,075 compared to 43,875) this week than expected due to the hold-ups, giving clues about how Britain might be impact by the delays.  

However, Britain does not provide details of daily deliveries, so it’s impossible to tell how much the scheme is being hampered in the UK.

BioNTech, the German firm partnered with Pfizer to manufacture the vaccine, said that supply would revert to normal levels from January 25. But German health chiefs warned the issues would last for three to four weeks.

Ministers have always said that supply will be the ‘constraining factor’ in the vaccine rollout.

AstraZeneca said its 2m dose a week target — based on the UK’s total order of 100m divided by 52 weeks — was achievable by the end of this month but, again, there is no way to tell if it is meeting that supply yet.

Government sources have dismissed claims there are 21million doses of vaccines already in the country, although they refused to give details of stocks saying it would be a security risk. 

Pfizer’s supplies have been dented by a factory upgrade at its plant in Belgium (pictured) which will continue into next month


Data shows have been huge regional differences in the number of people vaccinated against Covid.

For example, the English region leading the vaccine race, the Midlands, has given 713,602 first doses to its population of 10.6million.

Whereas the number of people being immunised in London was the second lowest in England (423,733), despite cases remaining among the highest in the country.

It has meant areas such as Slough and Newcastle have successfully immunised 100 per cent of their elderly care home residents while London has barely protected half.

The exact reason for the regional disparities has not been explained by No10.

But it has been blamed on a simplistic formula that did not take into account the size of GP practices and the number of patients on their registers.

London mayor Sadiq Khan told the Guardian that ‘the government’s original distribution formula meant that London missed out on its early fair share of the vaccine’.

He added that the vaccines minister Nadhim Zahawi ‘assured me that supply and distribution will increase, and an amount of the vaccine that reflects our size, density and the level of need in our city is delivered’. 

More than 4million Britons have now had their first dose — but rates vary across the country 


Each batch must be tested for quality by the National Institute for Biological Standards and Control (NIBSC), part of the UK’s medical regulator. The process takes at least five days. 

A sample from each vaccine batch – which can contain hundreds of thousands of doses – is biologically tested for quality and safety.

Manufacturers must also carry out their own tests on each batch before submitting results as evidence to the NIBSC. Delays in providing these details – or any failure to meet standards – can slow the whole process down.

Only once both sets of tests have been completed – and the manufacturer’s results deemed acceptable – is a batch released by regulators for use by the NHS.

More doses are now being produced, which increases the workload for laboratories handling quality control.


While the Pfizer vaccines come pre-prepared, some of the Oxford University ones are filled and packed into vials at manufacturing plants in the UK.

There are concerns over shortages of glass vials, but Government sources have insisted this is not the source of the current slowdown.

But experts have warned this could cause issues further down the line, when the UK factories have to start juggling multiple vaccines s well as other non-Covid products.

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