If you are put off moving the master by the earlier posting, why not leave it where it is and fit an extension socket to the position required and wire from that to the master. I don't believe there is any problem with that.
Get down to your local DIY place and buy an extension socket. It will have fewer components in than the master presently fitted. You'll need some telephone extension cable (you'll need to use 3 cores, so 4 core or 6 will do, just leave the others spare).
With the cheapo plastic tool, connect the blue wires to terminals 2 and the blue/whites to terminals 5. These two terminals should already have the incoming BT cables connected. One of the previous posters didn't mention that you have to connect the terminals 3 together on each socket. The correct colour to use is orange (if you want to follow the BT procedure).
So to recap. Mount your extension to the wall, run your cable from the new on to the original master. Connect your extension socket as follows blue to 2, blue/white to 5 and orange to 3. At t'other end connect blue to 2, blue white to 5 (already have BT wire in) and orange to 3 (won't have anything in). If you can only get alarm cable with different colours, just make sure that they go to the same tewrminals on each socket.
BTW. the difference between the master and extension sockets is that the master has a couple of components to prevent interference and damage from lightening, so really it would work if you had more than one master BUT it also contains a resistor that BT can measure from the exchange that will tell them if the line is intact so if you had more than one master, this reading would be reduced and would give the impression of a cable fault. So the master MUST be the nearest to the incoming wires and any more have to be extension sockets. I believe you can have up to 3 extensions.