I've just received this from Brian Alps...very sad news indeed.
I have just received the Autumn 2012 Edition of In Depth addressed to my father.
It is with great sadness that I must advise you that he passed away on the 30th July this year. He read the magazine regularly from cover to cover and remained interested in model submarines until the end of his life.
I have one or two editions when you featured either him or his models and if you have any back copies mentioning John Darnell I would be very pleased to receive these as a record to his dedication in this field.