Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
Your income is or will be:
PO Counters - 931.
State Pension - 627
Canada Life - 19
NHS - 6096
Total - 7678
This is below the personal allowance of 11000 so you are not liable to Income tax (IT).
I suspect that the some of the data you have given me in your question is monthly. Please advise the annual amounts in gross terms.
Well I can; I make your annual income 25140. Take off personal allowance of 11000 leaves 14140 exposed to IT at 20%, 2820 [say 236 per month].