Monday 6 August 2012 4.59pm
Well it's a bit of faff but go the map here
follow the instructions. You basically zoom in and click where it is then click on the balloon that appears and then click 'next' under the bottom left corner on the map. You'll then have a few pages to fill in where you'll be clicking 'none of the above' and 'other' etc.
I've just been looking and I've found a phone number.
0843 222 1234
Under which it says
'You pay no more than 5p per minute if calling from a BT landline. There may be a connection charge. Charges from mobiles or other landline providers may vary.'