Update: please no-one else call Total Parking as a result of this thread
I just called to ask Total Parking about this site, and apparently I wasn't the first to do so today! The folks on the phone aren't able to give a conclusive answer, firstly because no-one in that office was really sure, and secondly because they want everything to be communicated in writing for accountability - last thing anyone wants is to get in trouble for giving misleading advice. They said that they don't want to come across as rude or unhelpful, but there's really no answer that they can give, and they didn't relish the prospect of explaining that to lots of people as a result of this thread.
I was advised to email
[email protected], which I'll do after posting this message. I'll update you if I hear anything back.