Colin's old premises do not fall within Bircherley Green so Clive may not have any details. Always worth asking Clive as he is a man mountain of information. If not in office next to New Look he may have moved or be moving to new office in car park on level A. I think he has posted his emergency number on the door. Can also be found early morning sweeping the site access road by the river. Not always a easy man to pin down - worth it though when you do.
I believe Colin lives in Puckeridge so may be worth a discreet enquiry through the usual sources.