Any Irish plumbers who can help me shut off the water to my sink?

So we've had a dripping tap in the kitchen for a short while now. The landlord said it's their responsibility, but hasn't sent anyone to fix it. The drip turned into a steady stream that can be worse on different days and now causes the pipes to whine and hum occasionally. The problem is we will be going away eventually and I fear the worst will happen when we are gone. I would try to fix it myself but I'm American and everything is just different enough that I can't find how to shut the water off to the tap. There doesn't appear to be any shut off under the sink. There's a boiler in the closet that feeds the hot water to the sink with about 4 shut offs (some of which are gas) and no diagram or explanation. There are also 2 large tanks in the attic with shut offs as well. ( I can add pictures later in the day when I have access) I've flipped many of these shut offs and nothing stops the drip. The access to shut it off at the street was sealed shut during recent road works. I'm at a loss. Any help would be much appreciatd.