A mix-up with the appointment cards meant people had been given Thursday’s date for an appointment when the centre was closed. They should have been told to attend today (Friday).
This meant disgruntled residents had to repeat the journey to Grantham today as well to get their jab.
The leisure centre is the main vaccination venue for Sleaford area patients.
A spokesperson for NHS Lincolnshire Clinical Commissioning Group, which organises the GP network-led vaccination service for the area, said: “We became aware of an administrative error resulting in people being given appointments for covid vaccinations on Thursday, at the Meres Local Vaccination Site, Grantham, when the site was not open.
“We apologise for the inconvenience this will have caused.”
He advised that anyone given an appointment for Thursday should attend for a vaccination at the same time on Friday at the Meres.
It was put down to an administrative error as the wrong date was written on the appointment card at the previous visit, even though the Meres was always due to be closed on that date.
Although the site was officially closed, the vaccination team did do some jabs in the afternoon anyway.
The Lincolnshire Showground mass vaccination site is expected to have carried out 50,000 vaccinations by Wednesday, as anyone aged 40 and upwards is now being invited to get their first vaccination. Seventy per cent of Lincolnshire adults have now had their first jab and over a quarter of the population has now had their second jabs.