Is it worth saying about the 10 minute grace period?
No - a grace period is a period added to a permitted period of parking. In this case, the driver seems to have arrived, chosen not to park, and leave. In this case, a
consideration period applies - this is a period of time allowed in order for the driver to consider the terms and conditions on offer and decide to accept them, and park, or to reject them, and leave. This is generally a minimum of 5 minutes, not 10.
Just to clarify, before submitting the wording suggested by jfollows - are you the registered keeper, with the V5C document in your possession?