been through similar, and my understanding is that only the local authority can formally issue you a ticket, not a private company.
i had parked slightly over a space in our car park last Xmas, and there the a private company that supposed manage the parking. they ticketed my car, but not the car next to me which was more wonky and was the reason I parked skewed in the first place.
i was away at the time time, so had 4 tickets (1 per day) when I returned.
cowboys the lot of them -
http://forums.pepipoo.com/lofiversio...hp/t73686.html (this isnt me by the way, just an example)
I would certainly not reply to them. They sent me sooo much rubbish in the post that I asked a solictor friend to send them a letter implying they were harrasing me, and havent heard from them since (about 4 months ago).