Hi Mike,
I know what you mean about the hose set-up, my early Superheat (i think also known as the MHP model) has a single lever on the top and the pump is engaged by moving a lever inside the machine, the MK2 had the operating lever on top.
My Mk1 Superheat has the hose inside which you can pull out and store in a flick-out hook while the machine is in operation, the MK2 has the emptying socket inside the washtub. The MK1 has the long logo the MK2 is the iconic "V" style logo.
I wonder if this machine was an early MK2. Interesting how machines had different variations.
Cheers Keith