Yep but you'll need a time machine as you will need to contact BT for the new phone line 5 years before you know you are going to start building the house to be

Yep but you'll need a time machine as you will need to contact BT for the new phone line 5 years before you know you are going to start building the house to be on the safe side. I know of plenty of people who tried to organise their phone line before they started their build and have moved in and are still waiting for a phone line 6 months later. It's the same with all utilities in the UK; totally chaotic constantly changing bureaucracy. You have to know the secret telephone number to call to get someone who is not working in a general call centre. Even then it's surprising how often they don't seem to know the procedure for getting a new house connected.