The Blue Badge Scheme only applies to on-street parking.
Blue Badge holders (including vehicles that are exempt from road tax) are charged to park in car parks and are therefore required to buy a pay & display ticket
A free hour is given on top of the expiry time when Blue Badge Holders buy a pay and display ticket.
The Blue Badge and clock must always be clearly & correctly displayed in the vehicle. The clock must be set at the time of arrival and the Blue Badge displayed, expiry side up.