I'm going to repeat for the final time that distance from the cab is not the only factor, You need to know what route the U/G cabling takes, and where the DP's and JBs are.

It's even possible that line lengths have been estimated from say any attenuation records they may have, or likely based on estimated line length to the entrance of the property. If the line is with VM then they won't have any data, which is why some houses may not have an estimate, or the line length may be too long to be of benefit.

Now I'm going to try again put it in simple terms, but you have been hanging around DSL forums long enough to be able to know the basics.

This is the BTw estimates for my daughters street.. on first glance it doesnt look logical. <-- signifies my daughters house. NH = some new builds. The cab is around the corner & 2 streets away from #1. I'm only doing one side of the street.

1 330

3 330

5 238

7 245.2

9 150.4

11 249.1

15 264.9 <---

17 273.2

19 281.2

21 228.6 NH

23 264.9 NH

25 256.9 NH

So how can my daughters estimate of 265Mbps be 115Mbps more than a house which is nearer the cab. And how can a house further away from the cab than she is get 16Mbps more? It doesn't make sense when you look at it like that.

Next... It's really easy to see why when you start filling in the blanks. They have telegraph poles and using g.maps I can see that certain premises are on a DP which is further away from the cab.. but then the distance from the pole back to the house can add quite a bit of line length. Now Lets add the locations of the DPs.

1 330 DP Corner of street which is also serves some houses on the main road.

3 330

5 238

7 245.2

9 150.4

11 249.1

15 264.9 <---

17 273.2

19 281.2 DP I can see that this pole is serving #19,17,15,11 & #9

21 228.6 NH

23 264.9 NH

25 256.9 NH

Now lets fill in the blanks and it all makes perfect sense, why some lines get more and some less despite the house distance from the cab.

1 330 DP DP[a]

3 330 DP[a]

5 238 DP[a]

7 245.2 DP[a]

9 150.4 DP[b]

11 249.1 DP[b]

15 264.9 <--- DP[b]

17 273.2 DP[b]

19 281.2 DP DP[b]

21 228.6 NH DP[c]

23 264.9 NH DP[c]

25 256.9 NH DP[c]

#9 has a much longer line length than #19 despite it being nearer the cab, because it has to go all the way to the pole outside no #19 then loop back on itself which another length of cable from the pole back to the house.

Whilst its easy to see when on OH cable, similar will be happening on your estate just that its hidden UG. There will be lots of houses nearer the cab but with longer line distance due to location of the JB.

Honestly max if you can't get this theory which has taken me ages to type out, then I give up all hope. Please make sure you read it properly and try to digest the info or else there is absolutely no point me wasting my time trying to explain.