There are two entirely separated parking bays here, because the building entrance has double-yellow lines in front of it. The bays to the right of this entrance have no sign whatever, albeit the ticket machine is located there, but that is not a sign. The other set of bays where you parked has just a tiny sign on the side of the other building entrance. So not ideal signage, but you have a duty, as a motorist parking in a marked-out bay, to look for a sign for that bay. It appears you didn't, yes ? In that case you are in difficulty because there is a sign, and its only a few yards from where you parked the car.
