Booster shots this year are supposed to be limited to high-risk groups and carers, but a friend pointed out there’s no formal definition of carer beyond “regularly looking after someone ill or disabled” and no checks - you don’t even have to be registered with a GP. So if you feel like you qualify you can just book an appointment or find a walk-in and just go for it

I have a caring responsibility that qualifies, but in any case more vaccinations are good for everyone. So unless and until there’s news of shortages I suggest you investigate the NHS website:

https://www.nhs.uk/nhs-services/covid-19-services/covid-19-vaccination-services/