I’m setting one up for my BIL and was told he can have a fourth jab after three months from his last one, but it’s recommended to wait 6 months. The NHS England web site provides an online booking system so you don’t need to wait for any letters or texts or your GP. All that’s required are your input details and that you meet the criteria.I thought that you had to wait at least 6 months from the last third jab, ours was last September.
https://www.nhs.uk/conditions/coron...rus-vaccination/book-coronavirus-vaccination/