Cascade 2 isolator - Symphony 1993

I can't find the mains switch to turn off the cascade water heater. It's shown in the wiring diagram and in the manuf. Info but can't locate it? Any help appreciated by this new owner.

In my duetto which is similar layout it is cleverly hidden in the locker at floor level together with the consumer unit
I have been meaning to re locate it but cant find a way to reroute the cabling

Thanks Felix. Finally found it above the Fridge worktop, as far from the heater as it could possibly be . For some reason thought it was for the Fridge🥴. Now  labelled of course 🧐

If yours is like our Duetto the switch you have found is the control for heating your water on gas, there will be a mains isolator tucked away elsewhere probably with a red indicator lamp, try the floor locker next to the fridge.
Graham