Now, not too long ago I flushed the toilet and there was nothing - so I checked the valve in it. I've had a little bit of trouble with that valve so I make sure it wasn't stick.
It wasn't - I then checked the cold water and nothing.......
So, I have a search around the net - I now know what has happened and why there was so much traffic in the city centre.
This is the reason why
This route is my main route to work (although I have useful alternates), the reason I have no mains water and why there was so much traffic.
Luckily the hot water tank still has some water in so I have enough to keep me going for a bit. I've turned the water heater off so it doesn't break and hopefully they'll have the pipe fixed before I run out of enough water to make tea........
Edit: Water now back on (discovered it at 10.10pm) - they've either repaired the problem or rerouted (the latter is more likely). Now I have the fun of getting the air out of the pipes - not too hard though.