I'm so embarrassed 
I've lived in my house for 5 years and I still can't find it. It's a big house but not THAT big. However, the electricity meter was hidden away at the back of a cupboard behind some shelves...really odd place for it be...so I'm wondering if the previous owners (who had list of work done on the house have hidden the stopcock somewhere odd too.
The last time I had a plumber round to service my boiler I asked him to look for it but he couldn't find it either -so it's not just me being really stupid- and he looked everywhere he could think of. I'm a bit embarrassed to hire someone specifically to look for it!
One day I'll have a flood or a leak or something and then I'll be buggered...
Can anyone think of a way I can track it down?