"Great care, awful parking"

Attended today for a pre-op assessment. No issues whatsoever with that, it was on-time, efficient and courteous. Paying for the car parking, however was horrendous. Firstly, whatever you do don't forget your arrival time if you are paying on departure - you will need it to calculate how long you have stayed - yes you have to manually work this out. Paying for time in advance is of course impossible when you have no idea how long your procedure will take. Secondly, woe betide you if you want to pay by card - I gave up after 5 attempts. Be warned that you will be issued a receipt that looks like you have paid successfully, this will most likely be a void receipt. Thirdly, don't try to pay by phone - I eventually got through to the number shown on the parking notice to be continually asked for my login details - I don't have any as I don't have an account. Eventually a kind fellow sufferer managed to find change for a 5 pound note I had - the only cash I was carrying - and I managed to pay by coins. The whole parking procedure is unecessarily complex and non-intuitive, and appears to be designed purely to trap the unwary. I speak from experience as the last time I visited I received an 80 pound demand for non-payment through the post - I thought I had paid but the transaction was not complete. I have no issues with the cost of parking, but I feel that this parking system is a disgrace - anyone attending hospital has far more important things to consider than car parking. Be warned!