Stop ivy roots growing

I have a 20 year old ivy plant covering the front wall of my house. It is planted adjacent to the wall in the corner with our party wall - I.e. very little room to excavate.....
I have discovered that the roots have mangled my phone services duct and more importantly are beginning to disrupt my incoming gas line and electricity feed.
I have no problem with cutting back the plant as a whole. My problem comes with the roots. Physical removal will be very problematic given the proximity of the walls and services. So I'm thinking of how to stop them growing any more.
I'm looking for advice on how to stop root growth.
Thanks.

 

I assume its one single large woody stem?
If that is the case I would cut it off cleanly and if big enough drill some holes in the top of the stem.
Get some SBK stump killer and pour it neat into the holes, but try not to spill it all around.
I use a hypodermic for this without the needle.

Check in a couple of days and refill holes if necessary.