The rules for Blue Badge holders differ by location and parking operator. You should in the first instance always refer to local signage for full information on whether or not Blue Badge holders are required to pay for parking at the location.
Alternatively, you can search our Parking Locator tool for any details relating to a specific location. If there is no mention of Blue Badge holders being able to park for free then you should assume that you are required to make payment and proceed accordingly.
Your Blue Badge must also be displayed at all times regardless of whether a parking fee is applicable or not.