That's the beauty of the NTE5 master with its hidden test socket. Not only does the master come apart easily to wire to the front, the test socket allows you to disconnect all your wiring for test purposes. All wiring from the test socket onwards is the customer's property and responsibility.
Yes but its a shame that one cannot move a Master socket oneself without incurring the wrath of God, or BT as they are also known as.
I will try a simple extension cable moving the modem from its current location ias far as the extension will take it, coupled with a few tests (pingtest, speedtest etc) and see what differences in performance I get. If the changes are significant, then I'll look at the project from another angle. If not, I'll start looking into MHC suggestions although I'll still have to put some form of neat blanking plate with a hole in it or grommet in order to make the cable going through the wall look a little neater.
The only other solution would be to contact BT, take out another mortgage, and pay them to move the Master face plate to the room I wish to move it all to but this will be painful and expensive.