Update

Been to the tyre shop today,

He said,
Seen this problem before ,

About four ago on the Avon storm, had the same issue, ,
Avon reply was , to carry on riding, as it's only the top layer which is the issue, and it will ware down,.
So a few more miles , it should ok,

I am ok with this, as I love this tyre and also I can't afford to replace both of then.