Thanks so much for the quick reply.

I haven't got the newsletter subscriber mod installed.
But I did take a peek at the database and looked in customers and saw that customers_id was a bit jumbled.
It started off 3, 9, 4... then caught up a bit but this is the cool thing, it went on numerically after around 15 right up to 111, 112, 113, 862, 115, 116 and so on.

That 862 has jumped in where 114 should be. But in the admin there isn't a customer 114. I'm starting to convince myself that 114 was this customers original id.

So what I did was clicked customer_id in the database to sort the numbers in decending order and that shows them as all in the right places numerically.

Do you think that might save the day?

Thanks so much once again