Wetpixelers,
This is a long shot.....but you never know.....
Last week I picked up a copy of "Underwater Photography" by Derek Townsend in a secondhand bookshop. It was first published in the mid 1960s and I have a 1971 vintage edition. There is much in the book that is relevant today, plus a heap of information that is just out of date (Anyone remember ASA 25 film?) and some snippets that just make me chuckle.
I know this is a really, really long shot but its worth asking before I start down other avenues; I'm trying to track down the author. Has anyone contact details for Derek?