The BT company responsible for installations is called Openreach. www.openreach.co.uk They are at 'arms-length' from the rst of BT and do not normally talk to end-users - in your case they will need to however.
To run cable over your property BT (or any other company) need a Wayleave. They do not necessarily need to pay you rent, it depends on the terms of the Wayleave.
There may well be a Wayleave extent (from before your time) but having said that, they should still have asked your permission before drilling holes in your property.
T
August 2009