Many local authorities offer a carers card – sometimes called a carer’s discount card -  to help you prove your identity as an unpaid carer. You can use it as - or alongside - your personal ID to let supermarkets, GPs, pharmacies, or attractions know that you are an unpaid carer.
Be careful with websites that offer carers’ discount cards for a price, you should not have to pay to prove that you are a carer. Check with your local authority to see if they offer a carer’s card.