Hi All,
this is the reply I received from the free legal assistance team, hope it helps sort out this grey area.
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If you are legally parked then you should not be prosecuted. However you should make sure the keys are not in the ignition or they could potentially prosecute you for drunk in charge
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It would appear that the information I got back as already been covered by previous posts, but at least if neccessary we can quote the reply from the above people.
Happy Camping