Installation of equipment

[Chippy14]

I currently have FTTP via County Broadband. It was over £50 per month so I am switching to Sky at £25 per month. I don't understand why an engineer needs to do this? As a listed property no equipment can be attached to the outside of the building. The ONT is hidden under the decking, I don't want to take the decking up and I doubt the engineer would be willing to anyway. 
Currently the cable comes into the house via the air outlet. 
im wondering if I should cancel the contract although I'm sure that will prove impossible 

[Waveman · Accepted solution]

Looks like the network partnet is City Fibre, which is also a Sky network provider, however, it may be that the network provider for your area is Openreach, so the ONT would need to be changed. 

This link may give you more information.

https://www.openreach.com/fibre-checker