Most private parking spaces are made available for use with conditions attached - time limited, pay and display charges, permit-only parking for residents, employees etc. If the conditions are reasonable and clearly signed then any breach can be dealt with.
Since October 2012 enforcement action can't involve wheel clamping or vehicle removal so most infringements will be dealt with by issuing parking charge notices.
The parking charge notice will either be put on the offending vehicle or the non-compliance will be detected by camera and a parking charge notice will be sent by post to the vehicle keeper registered with DVLA.
Buying a car
'Crash for cash' and 'flash for cash'
Unexpected charges - paying for road damage
Driving offences abroad
UK driving advice for visitors
Photocard driving licence
Smoking and driving
Parking on private land
Vehicle defect rectification scheme
Penalty Charge Notices (PCN)
Fixed Penalty Notice (FPN)
The MOT test
Child seats and seat belts