Pleased to hear that last thing John - I'd wondered how you were getting 
on.
The heliochrome is no longer on sale. Partly at least I think because he 
considers it too primitive. I'll bring heaps of hot coals down on my head 
from both Dunstan and the gum mandarins by saying it produced results that 
looked rather like gums.
The latest work has I think been in a number of shows and awards; he is 
printing for quite a few very well-known UK photographers in 
fashion/advertising etc. 
He has invested a lot of time and effort in the development of the 
process. I was really impressed by the work I saw. It is available on 
exactly the same basis that Fresson has always been - you need to take 
your work to him and pay for the print. I think in every other respect 
they are probably superior to Fresson, though I suspect that kind of look 
could be created using this process. 
Peter Marshall
On Fixing Shadows and elsewhere:
http://www.people.virginia.edu/~ds8s
Family Pictures, German Indications, London demonstrations & 
The Buildings of London etc: http://www.spelthorne.ac.uk/pm/