I have just received a similar notice through the post for the same date only a few hours earlier.
I was actually on holiday and pulled in with my family to grab a snack.
I received the PCN from my hire car company who have acknowledged that they have passed my details onto Euro Car Parks.
As i am from Northern Ireland,
i cannot go back and check the sign and was unaware of the "pay by phone transaction" as this is unavailable in Northern Irel