I bought a pair of Blockleys through my dealer. He mounted them and all appeared fine. The date stamp was ten years old and they began to check almost immediately. They were replaced under warranty.
I have heard that ANYTHING over ten years is an automatic no-go.
My Cokers arrived two days ago and they are dated second week of April 2018.
The Avon tires were on the older side. Perhaps Morgan made a quick deal so Avon could clear out old inventory at a good price!?