MG ZS 120 strange water leak?

[mikey d]

alright, iv got a zs 1.8 16v and its going through 2 liters of water a day!! i was a mechanic so have checked every were for leaks and the thermostat housing has a leak so have a new one for it but when i drive the car 30 miles to work the water level is fine but when i go to leave its empty so i refill it but does anyone no were the water might be going as the sump has only oil in it? and i cant fint a major leak lol