Free Traffic Legal Advice

I received a notice to keeper PCN in the post today and I think its ridiculous. I entered a small area by a shop which I thought was just a small lay by for shop customers to stop, pop into the shop and leave. I was stopped for a total of 8 minutes. No signage as you enter or leave and just a small warning sign on the wall about 5-10 meters away from the last bay which i only noticed after I recieved the ticket. (Adress of area where this took place is 22 sea road, Bournemouth)

If anybody could help me fight this ridiculous ticket that would be a great help.