From what I have seen, two numbers to one location will, using he Number Checker bring up two sets of data one for each number - I did just try it on one pair I know of where the max attainable is over 100Mbps and both were identical. However others do differ.

Reason I asked the initial question about "What will happen if an address is supplied by two cabinets" or even two significantly different lines, is that I did not know definitively.

After thinking about those locations I know, I have one pair where they are from different cabinets, 5 and 28 - which happen to be adjacent. One returns a top line of 76 to 55.8 and the second, 63 to 48. However, only the latter has ever had broadband on it so whilst those are accurate the former set may not be.

I tried the address checker - only one address. The response was the first set of figures and the same cabinet number. But one set does not really give enough to go on.

https://www.google.co.uk/maps/@51.4371261,-0.9107573...

Sutcliffe Ave in Earley RG6 xxx Joint user poles with overhead DP's pan about and note the two DP blocks

https://www.google.co.uk/maps/@51.4369829,-0.9105259...

These two blocks are served from different cabs, one MUCH closer than the other, the DP numbers are the same, just that the secondary is postfixed by an 'A' I wonder what the checker thinks of these addresses ?

No one seems to have thought of the obvious (well to me) answer, the underperforming line is in the OP's house, what's the betting there's extension wiring attached, so bridge taps, routers connected on extensions, bell wires, the whole shebang.

Can the OP describe the set up and what's connected where on the house line please ?

In reply to a post by Zarjaz:

No one seems to have thought of the obvious (well to me) answer, the underperforming line is in the OP's house, what's the betting there's extension wiring attached, so bridge taps, routers connected on extensions, bell wires, the whole shebang.

Can the OP describe the set up and what's connected where on the house line please ?

I did ask:

In reply to a post by MHC:

Can you test both at the incoming test sockets with nothing else connected?

In reply to a post by MHC:

I did ask:

In reply to a post by MHC:

Can you test both at the incoming test sockets with nothing else connected?

That isn't going to pick up a bridge tap without testing that all sockets are dead with the master faceplate off.

NOTHING connected means nothing connected.

Yep, sorry, missed that bit earlier.....

I guess the issue is that a capped profile would mean it was harder to see improvement when testing as we suggest unless the OP has access to more in depth stats.

In reply to a post by MHC:

NOTHING connected means nothing connected.

It is fair enough to assume the new line to the garage has no bridge taps.

It is not safe to assume the house one does not. A bridge tap does not need anything connected. The mere presence of the wiring is sufficient. Hence my statement that all the (house) sockets need to be tested to be dead when the faceplate is off.

No need to shout either.

A bridge tap does not need anything connected. The mere presence of the wiring is sufficient.

+1.