Ignore. Ignore. Ignore. ZZPS (and their sister company GCTT) are useless debt collectors with no power to do anything, never mind the fact that this is for an alleged breach of contract in Scotland.
Nothing will happen. Get on with your life and use the letters as kindling or emergency toilet paper.
In Scotland there is no Keeper liability (yet). If you, as the Keeper, have not identified the driver (no legal obligation to do so to an unregulated private parking company) they cannot transfer liability from the unknown driver to the known keeper.
