I have been suffering form highly variable download speeds, often below the upload speed of 8Mb/s.
Previously when I ran the BT speedtest it would indicate in red that there was a problem because the download was below the acceptable speeds for the line of 10Mb/s.
A fault was raised as it also failed on test 3 where only BT is involved.
Today I reran the BT speedtest and got
1. Best Effort Test: -provides background information.
> Download speedachieved during the test was - 8271 Kbps
For your connection, the acceptable range of speeds is 8000-28532 Kbps .
IP Profile for your line is -28532 Kbps
2. Upstream Test: -provides background information.
>Upload speed achieved during the test was - 7758 Kbps
Upstream Rate IP profile on your line is - 10000 Kbps
We were unable to identify any performance problem with your service at this time.It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.So they appear to have changed their minds on what the acceptable line speed is.
This traffic congestion they refer to was also happening when I was logged in as a BT test user on their network only.