Hi...
Ezy will not accept any proof of employment that you have handled. In other words, you must supply the I.D Dept with names and addresses of employers and they send out the official paperwork. You can only chase your ref's, you cant play any other part. I was waiting on one of mine and suggested that I would go to the place it had been sent too, and pick it up. I was told that if I did, that reference would be deemed not acceptable.
So, in short if you are asking your ex employers to send this proof to you, so that you can ammend dates and stuff, great. If it is for any other reason I would not bother as it wont be accepted. On the up side, at least you will have current names and contact numbers, having done your homework!!
Hope I have not confused ya!