Yes, its two seperate two port valves, not a 3 port as shown.
I’ve just checked again and my ‘assistant’ has now ben relegated to other duties !! The light on the CH valve is not illuminated when its on, she was looking at the HW. Both of these were replaced in Sept ’02, is that about right ? As it sound as though the electrics are shot, is the electrical unit on top of the actual valve replaceable on its own or is it a complete unit with the valve ? If seperate, is it a job for an enthusiastic amateur,or one for someone not likely to flood the house ?