Frustratingly Low Broadband Speed

Question

Hi 
I had been with Demon ISP for 9 years and decided i'd had enough of their monthly capping. Furthermore, I could never seem to get any decent throughput download speeds despite having good sync speed from the modem to the exchange.
I elected to go with BT as I naively believed that if I had a problem with my phone line that was affecting the BB connection, it would be easier to solve as they would be a "one stop shop".
Well, after around 4 weeks with BT I'm no better off for speed.
I have a Home Hub 3 and despite letting the system settle-in for 10 days the sync speed is showing circa 8Mb/s however I'm clocking no more that 1.7Mb/s no matter what I try.
From the outset I've had the router plugged direct into the master test socket with no more than one telephone connected (and disconnected that phone on tests too) - and have used both fresh microfilters supplied by BT too.
I have opened three fault cases with BT's help line and despite the operative agreeing there is something not right, the fault gets logged, and then a few days later gets closed.
The BT help also carried out a phone line test and they said there was something amiss - again the fault went on my log and now it's gone entirely.
I have a feeling (due to something an engineer once said to me when we had a total phone line outage a few years ago) that some of the copper lines from the exchange aren't great but I can't be sure.
Here's the modem stats and yes I have just reset it within the last hour..........
I would be very grateful for some insight please.
ADSL Line Status
Connection Information
Line state:
Connected
Connection time:
0 days, 00:30:37
Downstream:
7.938 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
13.1 dB / 26.0 dB
Line attenuation (Down/Up):
19.7 dB / 10.5 dB
Output power (Down/Up):
20.0 dBm / 12.3 dBm
FEC Events (Down/Up):
0 / 0
CRC Events (Down/Up):
1 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
0 / 0
Error Seconds (Local/Remote):
1 / 0
Solved!
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Answer 1

Morning
Have given the BTHH3 plenty of time to "settle down" and for my IP profile to improve.
As suspected has made zip-all difference.....
Connection Information
Line state:
Connectedppp0_0
Connection time:
4 days, 07:14:58
Downstream:
7.938 Mbps
Upstream:
448 Kbps
ADSL Settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
12.6 dB / 26.0 dB
Line attenuation (Down/Up):
19.7 dB / 10.5 dB
Output power (Down/Up):
19.9 dBm / 12.4 dBm
FEC Events (Down/Up):
2107 / 0
CRC Events (Down/Up):
2 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
HEC Events (Down/Up):
1 / 0
Error Seconds (Local/Remote):
2 / 0
I have carried out a BTw speed test and get the following results;-
1. Best Effort Test: 
Download Speed : 1.68Mbps
Your speed test has completed and the results are shown above, however during the test an error occurred while trying to retrieve additional details regarding your service. As a result we are unable to determine if the speed you received during the test is acceptable for your service. Please re-run the test if you require this additional information.
Which is around the same speed as i've been getting all along.
Oh and i've tried three different PCs running different OS, and some with fresh Java installs, and this makes negligible difference, and in all cases the error (as described above) is always reported - My IP profile never displays.