You need a permit to park within the pedestrian zone in the city centre.
Types of permit
Access is allowed every day from 6pm to 9.30am, except Thursdays, when access is allowed from 8pm to 9.30am.
Access is allowed at any time when vehicles are essential in an emergency. An emergency is a situation that could result in a threat to life, health and safety or access to facilities or utilities.
Each permit costs £30 a week or £100 for a year.