Cannot tell you if he is still in business, can tell you that he is not "computer literate".
I have experienced the same problem in the past, I would say that you must try with the telephone. He can leave responding an incredible length of time.
Anders Mike Collingburn was certainly in business just before Christmas as I spoke to him on the telephone and bought something from him which arrived without problem.I live in the NE of England and I have not heard any local reports that he is not in business.
Well I have had problems before getting in touch with Mike. But he was talking of doing less in 2008 when I collected seats for a Q-Type replica. I will try to give him a call instead of using my computer.