Thank you so very much, Clever Octopus.
As I am at the office on my lunch break, I have been able to get my employer to write up a letter to state I have been working for them consecutively for 3 years. I assume my Council Tax bills for the 2 years prior to this should prove I was here before I began working?
I can not state enough how valuable this forum has been to me over the years. It's little things (like this employer letter) that I would have missed if not for the help of others in here. Thanks again. xx