fibre profiles question with my account

[#1]

Estimated line speed:
74Mb (Download speed could vary depending on line conditions. Estimates are the maximum speeds that your phone line can support. These speeds are dependent on the package you choose.) - Checked on 2014-12-30 17:35:52
then this
Estimated line speed:
66Mb (Download speed could vary depending on line conditions. Estimates are the maximum speeds that your phone line can support. These speeds are dependent on the package you choose.) - Checked on 2014-12-30 17:45:52
and this is my current speed

So why has my profile been dropped in a matter of a few mins ?

[#2]

it may not have done as the estimated line speed is notoriously flakey
the only way to check your profile is via the BT speedtest

[#3]

Hi St3,
That's the estimates rather than the profile for your line. The profile is still at 77.4Mb, hence the speed still being at a high level.

[#4]

ok thanks 

[#5]

BT are known to make changes to their estimates, as they get a clearer idea of what your line is like - and what it considers a "comparable set of lines" to compare it against. They then give your line an estimate range that runs from the 20% to 80% percentiles of that set.