Chris Chambers

I have had my collection for a few years, and I would like to check the value of my collection, as I have been asked by my insurance company to give them a breakdown of my collection and there current value. I have gone back to the place to whom I have purchase the coins from “The Royal Mail” and they informed me that they can’t help. I have been informed that there is a reference book that the insurances use, but when I do a google, I can’t find any reference to any books, which the company uses. Can anyone help me, in advising me in what reference book I can use or website?