ps is there a way to attach screen grabs to posts please?

No, upload it to something like https://imgbb.com/ and post the link.

The availability checker for my line gives
VDSL Range A (Clean) 61.1 44 13.4 8.5 39.8 Available -- --
VDSL Range B (Impacted) 50.9 32.4 12 6 26.8 Available -- --

Modem status
Downstream sync speed:
49.00 Mbps

Upstream sync speed:
10.00 Mbps

Tech Log
Data rate:
10.00 Mbps / 49.00 Mbps

Maximum data rate:
13175 / 63585

Noise margin:
8.1 dB / 10.4 dB

Line attenuation:
20.4 dB

Signal attenuation:
VPI / VCI:
0/38

Modulation:
G_993_2_ANNEX_B

Latency type:
Fast Path

Data sent / received:
144192 MB Uploaded / 11548 MB Downloaded

Broadband username:
[email protected]

BT Wi-fi:
Active

2.4 GHz wireless network name:
BTHub6-xxxx

Without knowing what speed checker app was used hard to say, if its the ookla/speedtest.net one then happy enough to say that shows that 69 Mbps is a real speed.

Does this prove you should be able to get the same speeds?

NO

Issues...
1. Lines are not all created equal they may be lucky and on thicker copper with less joints than you
2. Routing can be different for two different houses even if going to the same cabinet
3. They may actually be connected to a different cabinet
4. Their broadband hardware may be working well with things like low target noise margin and G.INP which can boost speeds and yours might be stuck in interleave mode
5. If on two different providers, it maybe you are on a stable DLM profile whereas they are on the speed one, which affects how the DLM behaves and is set by the retailer when they order the service and they usually use the same profile for all their customers.
6. How certain are you that the cabinet is actually 800m away and not say 400m

Can you get it fixed?
If the speeds falls below the fault threshold then they might look at a fix, but more often at these sort of speeds they will look at the 800m and 50 Mbps and simply say no fault, and even if below fault threshold the ultimate remedy is to let you walk from the contract.

In short many variables and with no location information to go on, very difficult to say a lot, and people can be a little short as the Internet has a long history of people claiming and insisting various things and one day they slip up and the veil slips and reality appears. So past behaviour of others leads to people being naturally sceptical.

Or put another way, connection speeds above 70 Mbps on 800 metres of copper is approaching a record for VDSL2

So sync is inside the clean A range, so provider unlikely to entertain any visits to repair anything.

Note I have apologised for this reference
I maintain I was fobbed off last year
I certainly know "jack****" about this stuff (but could teach you a 5 day class on the internals, Performance Tuning and debugging of Transaction Server Computing and Low-Latency Messaging)
however in this case you hit the nail on the head
why else would I be asking experts in their field?

Line is synced at 49Mb
Should be nearer 63Mb

With the high SNR (noise margin, should be 6dB) it's likely your line has been banded/capped by DLM.

Nothing you can do about that.

So, your neighbour tests at 69 Mbps, your Max is 65Mbps. Is there much difference? Not really.

Depending on which speedchecker he used that could be reading high - for example I have tests that show over 79Mbps with an 80Mbps sync - that is around 4Mbps higher than it should be.

You need to find out why your sync is 49.00/10.00 with a 10dB SNR. It looks as though your line has been banded, have you been disconnecting and resyncing too often? If you can clear that, I would expect your sync to rise to 65 and actual speeds of around 62,

Thanks hope this works
https://ibb.co/j7spZ6

"have you been disconnecting and resyncing too often?"
not to my knowledge..

Neighbour asked twice what package and confirmed Infinity 1 ?