There are 2 areas to be covered. Parking tickets issued by Local Authorities, ie the Boroughs and tickets issued by Private Clamping Companies. I will set out both issues as there are completely different rules and regulations that apply to both.
The local boroughs use companies that employ bailiffs who are self employed and are "certificated" by a specific county court.
The clamping companies do not employ bailiffs, but the company director must be registered with AIS and their employees must also be registered with AIS
The bailiffs, the local authority, the clampers, the courts and the judges do not know all the procedures and the laws that apply. Read on.
These tickets are issued by the boroughs. If not paid, the fines increase and are then handed over to a company that employs a bailiff to collect the fines.
Legislation states that the local authority must abide by a specific procedure. The local authority must also be registered with the Information Commissioner's Office which deals with the data protection and the relevant sections it covers.
Most local authorities are not registered with all the sections they are supposed to be registered. The same applies to the bailiffs. They must also be registered and with all the relevant sections.
When bailiffs make contact, they must identify themselves with their badge, which shows their full name, the county court which with they are registered and the date their certificate expires.
If you do not open your front door, the bailiffs cannot force entry.
Don't fall for the trick, whereby, they promise they can cancel the fines, but they need to come into your house to use the phone to call their office.
Once in, they can take "walking possesion" of goods and come back to claim them at a later date.
I have researched all the laws and the local authorities and the bailiffs constantly break the law and have no right to seize your goods.