No. Studies have shown that most people can’t tell the difference between bottled water and tap water in blind taste tests.  There are regional variations in the taste of UK tap water.  As water journeys through the ground it picks up minerals such as calcium and magnesium.  If you find that you don’t like the taste of your home’s tap water you could try using a water filter or placing a covered jug of water in the fridge for a few hours.