Having got back in the hobby I decided to get some back issues of the SE mag 
and managed to get almost a full set from  guy in Cambridgeshire (via the 
Forum)  whilst down there picking my motorhome up. Looking through these I 
came across an article on the "Hydraulux" pump I recently acquired. 
According to a previous employee of  the manufacturer, "Craven's" there were 
only about 16 of them ever made, so it is a bit of a rarity!!