[MovedGoalPosts]

The official line is that you as the customer cannot alter the cables. If you get it wrong you potentially can affect the quality of your own services. In extreme cases you can also affect those of your neighbours. Messing with the phone line, on the street side of the master socket can be agains the terms of telephony provisions.

I anticipate there is a junction box on the outside of the house (usually brown in colour) into which the drop cable from the street cabinet will connect. From this your phone line wire and the broadband coaxial can be run.

Changing the phone line from that junction bo to the new master socket location is relatively easy. You might need some of those jelly connectors and a punch down tool. Just make sure the phone cable you get is suited to eternal use, i.e. the sheathing is UV resistant.

The coaxial for the broadband is more of a challenge. The connectors are mecahnically crimped, rather than the DIY screw on things you get for most satelite things. More improtant is the quality of the cable. It is not standard satelite grade co-axial. Indeed it's identification is quite difficult. I've seen numerous posts on this subject over the years and never seen the same thing mentioned twice. The common reference seems to be RG6, but that doesn't seem to mean a lot when you check sites such as Maplins.