It depends on what you organise with them/who's handling your claim.

You can organise a drive through assessment take a quote with you from the shop you want to get the work done at (making sure its an RAC registered approver) and you should be in and out of there within 10 mins then just book it in to the shop to get the repairs done.

Another option is to take your car to get assessed and leave it with the assessor who takes it to the shop for you (I wouldn't trust them myself, but it's your call)