Thankyou ALL for your helpful suggestions . I sort of knew I that it was probably my fault by returning to him when he cries . I find it difficult to ignore .
The strange thing is that he is fine if I'm actually out of sight it is when he can see me at the other end of the shop that is the problem . I can leave him in the car without any anxiety or fuss and he's also happy if I leave him with my partner . It seems to be only when he can see me and I'm giving him no attention as I'm busy with a customer .

Do I still just ignore him or would he be better left in a training crate at this point .

Thanyou again
Jane