The old house we bought has no master socket (NTE5 socket?) but just 6 normal phone sockets. They are all working fine.
The drop wire coming into the house is connected to a matchbox size white box (BT80A).
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out from this box are three cables. Two grey and one white. The two grey goes under the floorboard. The white is old so it must be the original, and this white cable goes in to another box (matchbox size box with round edges), splitting into two and down under to the floorboard.
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someone had added two grey extension cables to the first white box (BT80A). As far as I know this is illegal today because you can not wire anything into the line but only after the master socket (NTE5).
If I contact BT, will they came and fit a master socket for free? I have not contacted them yet just in case they will force me to pay for one.