Depends on what you do with the wiring and what that spiders web near the master is really doing
Looking at pictures I can see it being possible but would need to be onsite to trace wiring and verify everything before commiting.
If wiring is how I think it is the original Openreach engineer has removed an old junction box that was managing a star configuration and used to gel crimps to extend this to the A/B points on the master socket, and then another wire leaves the new master which is gel crimped to the extension.
No evidence of the four extensions that you meantioned in passing earlier, and where and how these fit into the picture is a big unknown.
In the face of the confusion, why not run a data extension from the VDSL socket of the existing master socket to exactly where you want it. A kit like
http://www.clarity.it/xcart/product.php?productid=16139 would give you the bits to do that
Edited by MrSaffron (Wed 27-Feb-13 17:17:54)