I have owned a house since April 2012.Outside the front of the house, there is BT trunking cable, telephone etc running along the outside of my house along the whole row of houses, so the trunking runs along all the houses, just undreneath the front windows.
I do not have BT services into my house, no broadband or telephone.The previous owner did, so there are still BT phone sockets in the walls.
The house is freehold.
Can I contact BT and ask them for rent or an alternative as their trunking coming across on my property without my permission?
No. You have no entitlement to wayleave ("rent") The cables are there with the consent of the previous owner and for the benefit of all the owners and you. Ask BT to make some exception in your case, by moving it and they'll charge you if they agree to doit.
If your property is fairly new it may be that the developer was paid a single wayleave payment to permit their cables to access other properties, there may even be an easement in existence.