The site my colleague had a record from was Hankley Common, where we also do some management work. I checked with him and he is going to try and locate his diary entry to find out exactly when he recorded it, but thinks it was roughly 10 years ago. I completely understand the apprehensions regarding the ID, and in my colleague's instance, I believe it was field ID only he was relying on. However, he was being advised at the time by Jonty Denton, so there is a good chance the ID was accurate. We are working on Hankley next week, so I will try to get a GPS of the exact location, and any other details I can get from him.