BT have given me estimated speeds of:
- download speed will be between 35Mbps and 36Mbps
- upload speed will be between 8Mbps and 9Mbps
Kinda disappointed with as we're only 400m away from the cabinet but we will see once its installed. Due live on the 29/7/2019.
30+Mbps is a lot better than 3Mbps anyway 
That is just an estimate, you might get more or less speed, but I think that is low for that distance, but I might be wrong.
I am on FTTP, but can also get FTTC if I wanted to.
Now I am at least 450m away from my fibre cabinet going the route our copper cables are routed, and I am estimated the following:
[VDSL Range A (Clean)]
Down: 53.7 to 76.2 Mbps
Up: 16.1 to 20 Mbps
[VDSL Range B (Impacted)]
Down: 49 to 73.8 Mbps
Up: 14.3 to 20 Mbps
Shown
>> HERE << results from the BT DSL Checker.
Maybe the results for mine is too high and might be due to its not even been tested so it might even be lower if I went with FTTC, but due to the state of our cable used on my line, it wouldn't be worth it, hence my copper line is no longer in use.
Don't forget its just an estimate, so if I was you I would just wait and see what speeds you really get when its live.
Paul