You were right though, no need for an engineer. So they wasted his time.
If you can run that BT Performance Test again, link in my first post, the results from that would be interesting.
Which router are you using? If it's the one you can get the stats from then those would be good to see as well, but don't go swapping routers at this stage if you can't get stats from the one you are on.
funny point you make here. with the sfi you see strange things, what may have happened is wholesale wanted an engineer in the exchange when they did this. it may have been a card wide issue and for some reason they don't like resetting the card blind.
i see it very often, no sync/poor speeds and what cures it is resetting the whole card, i would have though it would have been easy to do minus the engineer, but hey who its an easy fault if you get it
these comments are my own and in no way represent any company that i may or may not be linked too.