Why is there a hold on my account for petrol?

For 'pay at pump' petrol transactions, a request is made for a pre-authorisation of up to £100 to ‘hold’ from the merchant. This is just because they don’t know how much fuel is going to be bought at that time. The ‘hold’ ensures that you have the funds available for the maximum purchase possible which is £100.

Just so you know: This is a temporary hold on your account and within 6 days, the original hold of £100 will drop from your account, therefore only charging the original amount.