High Barnet Post Office is at 63/65 High St, EN5. Here is the sign which is outside of it (signs not facing the road is a defence you can run as are misleading signs).
|All 3 signs require some attention.|
To get to the parking meter at 85 High Road, N2 is going to take a while and doubtless you will be on foot, you don't move your car to go to the parking meter, you'll lose your space. It does give you the defence though that you had not paid as you had gone off in search of the meter using google maps as your guide.
Of course what the traffic warden should be doing is straightening up the signs that are there (why don't they carry a small toolkit so they can make minor adjustments on the hoof?) is reporting the sign that is wrong. Mr Mustard shouldn't be the one who has to do it.