Also my apologies for the confusion, we seem to have very different problems although BT working at arpys cabinet could be a link as they could have disturbed the wires for your line either loosening the connection or worse still fracturing the copper causing the drop in speed to compensate for the degradation. This could be a red herring but I don't think it's unreasonable to ask for an engineer given the circumstances and assuming all the regular user checks have been done.
No need for the apologies everyone, I'm grateful for the help.
I do find it too much of a coincidence that all my woes have started after the roll out of FTTC in our area. Shame that in their haste to roll out the new technology they are disrupting the 'old' one.
My intention, once I'm back up to my usual 4Mb/s download 0.9Mb/s upload speeds, is to disable the ASUS router's Dynamic Line Adjustment feature and 'lock' it to ADSL2+ however I fear that if the problem is down to activity at the cabinet in the street changes at my end won't make any difference.
