BT Copper lines are run in whats called Trunk Mains, therefore the more you are off the beaten track the longer the lines are likely to be for example there will be main feeds running straight up a very busy main road and then what they call trunks coming off the main down every road and then off those roads into every street and so on, so as someone already said your "as the crow flies" distance maybe 400 Yds or less but actual measured routed length could be over a KM but as a general rule BT say that under 1 KM full speed is allowed over 2.5/3km then half the speed and so on.THere are also lots of other factors invoved such as Electrical interference one of the worst is sub stations, due to the conductiveness of the copper, even adverse weather can effect Noise on a line, then there is the BT Final Loop this is the line between your Phone Master Socket and the Telegraph Pole, mine was so old it was deteriating at the top so I accidently hit it with a chisel and BT replaced it, also another thing to do is get an NTE5 Filtered master socket, these are much better than the standard ones and are already filtered, and try to plug the router straight into the socket rather than using extensions. Thats all you can really do at your end.
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