Re: think of the children!
"I checked a nearby competitor."
This is where the parking vultures are out to get you. Check and find the first one had the better offer but you incur a fine if you go back to their car park within a couple of days or whatever.
The trouble there is that car parking is really customer service but no doubt all siting negotiations are handled by estates or something with a similar title and they're more interested in their cozy relationships with landlords than avoiding having their customers being screwed over.