Broadband speed issue - router thinks it's fine(!) Anyone else seeing this?

[#1]

Ok - after realising that FEC / HEC / CRC   was nothing to do with BAK / SAK & CRAK .... I hit the interwebs to try and decypher the TLA conundrum.
After hours and hours of searching (about 30mins really) I finally stumbled upon a thread that showed a tool that could get these mystical stats.
In case anyone else is new to this type of diagnosis and doesn't have a clue about the terminology ... check this link: http://vwlowen.m3ezw.co.uk/phpBB3/viewtopic.php?t=398
Nirvanna
So, app installed and even did the hoopy telnet mod to access the advanced stats.
Behold ..... numbers ... and a graph (woot!)

Downstream:
Noise Margin:     15.1  dB
Connection Rate:  13960 Kbps
Line Attenuation: 24.5  dB
Power:            0.0   dBm
Max Rate:         16100 Kbps
 
SuperFrames:      5545464
SF (CRC) Errors:  85
Reed Solomon:     720910150
RS Corrected:     18685
RS Un-Corrected:  1912
HEC:              1562
Errored Seconds:  286
Severe ES:        10
Interleave Depth: 64
Bitswaps:         805

Upstream:
Noise Margin:     6.5   dB
Connection Rate:  1150  Kbps
Line Attenuation: 12.6  dB
Power:            11.6  dBm
Max Rate:         1152  Kbps
 
SuperFrames:      334022
SF (CRC) Errors:  10
Reed Solomon:     4289178
RS Corrected:     42
RS Un-Corrected:  0
HEC:              10
Errored Seconds:  6
Severe ES:        0
Interleave Depth: 4
Bitswaps:         0
Total Uptimes (From SF counts):
 WAN:   1 days, 02:11:54
 LAN:   0 days, 00:00:00
 

[#2]

I took both my old DG834PN and new DGND3700v2 to my dad's house tonight (he uses PN too) and tested them there.
His line speed is 3-3.5Mb and I was getting that no problem with both of the routers ... using my own microfilter, RJ11 etc.
I kind of knew this would be the case, but this proves that the hardware that I have is fine.
The BT engineer said the line was clean (and I hear no artifacts on the phone) so logically it must be either the exchange or there's some policy restricting my account. 

[#3]

I can see that your Fault Ticket is back with our Faults Team. They will be in touch once their further investigation has been completed.

[#4]

New stats ....
Total Uptimes (From SF counts):
System Up Time 38:50:25

Download:
Noise Margin:     15.6  dB
Connection Rate:  14070 Kbps
Line Attenuation: 24.5  dB
Power:            0.0   dBm
Max Rate:         16492 Kbps
 
SuperFrames:      8615927
SF (CRC) Errors:  6777
Reed Solomon:     1120070349
RS Corrected:     2955846
RS Un-Corrected:  26070
HEC:              23324
Errored Seconds:  4965
Severe ES:        0
Interleave Depth: 64
Bitswaps:         449

Upload:
Noise Margin:     6.4   dB
Connection Rate:  1176  Kbps
Line Attenuation: 12.6  dB
Power:            12.0  dBm
Max Rate:         1184  Kbps
 
SuperFrames:      304912
SF (CRC) Errors:  14
Reed Solomon:     2055703
RS Corrected:     0
RS Un-Corrected:  0
HEC:              10
Errored Seconds:  11
Severe ES:        0
Interleave Depth: 1
Bitswaps:         0