Hear me out - I am NOT anti-vaxx!!! 
My DS had leukaemia when he was 4, treatment up until age 8, check ups for 5 years after that and then he was discharged absolutely- no follow ups needed, deemed not at risk/back to normal.
He's 16 now and I was v surprised to receive shielding letters for him last year. Couldn't get to speak to a doctor but the receptionist thought the letter had probably been auto-generated due to his history of cancer which was now a distant memory. He did not shield as it seemed unnecessary.
Anyway, now he's had an invitation to get vaccinated. My first reaction is no, he shouldn't have it as he's not at high risk of complications if he gets Covid and the vaccine could be used by someone more at risk.
Is this the right decision? I'm having second thoughts as he's not been the luckiest lad with his health!
Sorry for long post, I wanted to give all details. Plus, if it matters, he has learning difficulties, autism and attends a special needs school.
Lastly, I do not want to ring the doctors to ask. They are completely overwhelmed.