Applogies for posting in an old thread but this one came to my attention via a customer who had found your forums.
The NTE5(A) is the latest versio of the BT Master Socket, it features a new filter on the bell wire circuit:-
BT Socket, Master, NTE5 Type
Legally speaking you are not supposed to replace the master socket.
The ADSL faceplate that is made by Pressac UK is designed to replace the lower half of the NTE5, this part IS designed to be fitted by the CUSTOMER. We sell two versions of the faceplate, 3 way :-
BT ADSL Faceplate for NTE5 Linebox
and 6 way :-
BT ADSL Faceplate for NTE5 Linebox, 6 Way Version
The difference between the two? The 6 way version allows an unfiltered extension to be fitted(so you can have your modem/router plugged in away from the master socket location) but still have a centralised filter for any other extensions.
The CTE5 is made by Austin Taylor.
If this post breaks forum rules then please feel free to delete it, if anyone has any queries please feel free to contact us-we are here to help!
We sell hundreds of these faceplates and are always on hand to help with any tech queries or problems you may have.