well I suppose LOAD A is the one activating the valve, 2 black wires go to the same place so I'm probaby going to have to unscrew the white box next to it to see which one of them goes o the valve doh!
(found some details on it, sangamo S610 2 61, 30A, 220/250v 50Hz of course)
I've just taken a look at the wires coming from the valve and there's 5 wires leading into a box of spaghetti with some wires going into another box which I'll have to take a look at when no one's getting ****ed with me cutting off the electricity. search of the model number led me to a modern replacement though