Poor Connection again.............

[#1]

Well the title says it all really, my FTTC connection has dropped off markedly once again. We had a power cut the other morning which has affected our connection, but it has been getting gradually worse for weeks, and its a process which keeps repeating itself every few months. My estimate on Bt`s checker is for 47.8 Mb down. I have never got close to that speed, the best I have had is around 35Mb. The speed usually sits around the 25-26 Mb mark, however I am now getting 19.9 With a ping of anything between 50 -79 ms!
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\J>ping -n 20 -l 1400 bbc.co.uk
Pinging bbc.co.uk [212.58.253.67] with 1400 bytes of data:
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=49ms TTL=119
Reply from 212.58.253.67: bytes=1400 time=50ms TTL=119
Ping statistics for 212.58.253.67:
    Packets: Sent = 20, Received = 20, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 49ms, Maximum = 50ms, Average = 49ms
Can someone please take a look at this and see if they can finally get to the root of this?
Many thanks.

[#2]

@dai
I've just checked your account and performed some diagnostics, where as I can't see any obvious issues I've just updated your speed profile to 27400kbs to match that of our suppliers.
My advice would be to head to http://faults.plus.net to raise this issue and I'm certain we can help.
Adam

[#3]

Hi Adam, rebooted both router and modem, leaving off for around a hour and half to ensure dlm didn't register it as a disconnection. The outcome was the same, so I have raised a fault number 73487725

[#4]

Our faults team will take a look into that and update you as soon as they can.