Please also give us a copy of the back of the pcn showing the full extent of the size of it.
If it is only half printed it seems highly likely that some mandatory content is missing but all of the content will have to be available to us in order to crosscheck against the relevant regulations.
I'm not in sympathy with your parking but luckily I like Barnet Council even less.
You had clearly been in the doctor's bay for a long time as your car is frosted over.
The sign is clear, 8am to 8pm for doctors every day shows on the sign.
'Doctors' is painted on the ground.
You had a front wheel outside the box which is a contravention that often leads to a PCN.
Removal to the car pound has not arrived in Barnet, you are lucky that your car was not removed (which incurs a fee of £280).
Best sharpen up for the future.