Would a faceplate filter improve my speed?

[#1]

This might be an utterly unhelpful post, but would it not be easier - if a bit more expensive - to shift the router to the master socket where you get 14Mb, and get a couple of Powerline plugs instead?
sorry if that's no help.

[#2]

Yes, but the third extension was running from extension 2, and has now been disconnected.
The other sockets were inactive when the front plate was off the master socket.
Current router stats:
Mode: ADSL_G.dmt.bis
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 121 64
Attenuation (0.1 dB): 215 98
Output Power (0.1 dBm): 0 119
Attainable Rate (Kbps): 10344 1164

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 8867 1163 0 0

MSGc (# of bytes in overhead channel message): 51 12 0 0
B (# of bytes in Mux Data Frame): 157 35 0 0
M (# of Mux Data Frames in FEC Data Frame): 1 1 0 0
T (Mux Data Frames over sync bytes): 2 4 0 0
R (# of check bytes in FEC Data Frame): 0 0 0 0
S (ratio of FEC over PMD Data Frame length): 0.5683 0.9829 0.0 0.0
L (# of bits in PMD Data Frame): 2224 293 0 0
D (interleaver depth): 1 1 0 0
Delay (msec): 0.14 0.24 0.0 0.0
INP (DMT symbol): 0.0 0.0 0.0 0.0

Super Frames: 6313983 90786 0 0
Super Frame Errors: 0 0 0 0
RS Words: 0 0 0 0
RS Correctable Errors: 0 0 0 0
RS Uncorrectable Errors: 0 0 0 0

HEC Errors: 4294967128 6 0 0
OCD Errors: 0 0 0 0
LCD Errors: 0 0 0 0
Total Cells: 2139022828 1123722 0 0
Data Cells: 58125701 2896 0 0
Bit Errors: 0 0 0 0

Total ES: 20 4294967290
Total SES: 9 0
Total UAS: 169 4294967213

Latest BT Speed test:
Download speedachieved during the test was - 7.94 Mbps
For your connection, the acceptable range of speeds is 2 Mbps-7.15 Mbps.
IP Profile for your line is - 7.82 Mbps
Upload speed achieved during the test was - 0.99Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps

[#3]

Moley, I actually bought a couple of powerline adaptors a few weeks ago, but could not get them working with my system.

[#4]

That sucks DaddyG, sorry to hear that. 

[#5]

@moley,  the wiring is now fine.
@DaddyG, it does look as though the Target SNRM has gone to 12dB with the consequential reduction in sync speed to 8867. We'll see if one of the DCT could post your Connection chart (PPP radius log) and if there are no disconnects over the weekend showing your line is stable, you could ask for an SNR reset.

[#6]

There haven't been any disconnects we've seen since around 10am yesterday morning:

[#7]

Many thanks for that Chris. Any chance of an SNR reset now then, it's looking pretty stable? The recent disconnects have been because he's been altering wiring.

[#8]

Thanks for that.  
Also, I've just found out there is no PPP disconnect on my bloody router, so won't touch it over the weekend.
10am yesterday was when I checked the master socket and it disconnected.

[#9]

SNR reset submitted, should complete shortly.

[#10]

Great, thanks Chris 

[#11]

I think one point that is being overlooked, tidy as the wiring now is, is that it's still "star wiring" with ADSL present on multiple extensions.
You WILL get a better result if ONLY the one extension has the ADSL signal on it.
So, going back to the original question and now we understand more of what you have, the answer is YES, if you proceed as follows:
1. Install a filtered faceplate which has BOTH filtered and unfiltered connections on the back.
2. Connect the phone-only extension to the filtered terminals
3. Connect the router extension to the unfiltered terminals
4. Retain a filter at the extension socket by the router
As I think was noted earlier, the extra 15metres or so should have negligible effect, unless it's untwisted cable.

[#12]

Thanks HP Sauce. Would the option of running cat5e from the master socket be even faster than that?

[#13]

Star wiring makes NO difference HP. That wiring standard is fine.

[#14]

OK, just did a new speedtest. The IP profile has gone back up, but I'm still only getting 8.81Mbps.
Download speedachieved during the test was - 8.81 Mbps
For your connection, the acceptable range of speeds is 4 Mbps-21 Mbps.
IP Profile for your line is - 15.72 Mbps
Upload speed achieved during the test was - 0.98Mbps
Additional Information:
Upstream Rate IP profile on your line is - 0.83 Mbps
Router stats:
Mode: ADSL_2plus
Traffic Type: ATM
Status: Up
Link Power State: L0

Downstream Upstream
Line Coding(Trellis): On On
SNR Margin (0.1 dB): 60 62
Attenuation (0.1 dB): 245 98
Output Power (0.1 dBm): 0 118
Attainable Rate (Kbps): 20808 1156

Path 0 Path 1
Downstream Upstream Downstream Upstream
Rate (Kbps): 17823 1147 0 0

MSGc (# of bytes in overhead channel message): 51 12 0 0
B (# of bytes in Mux Data Frame): 211 35 0 0
M (# of Mux Data Frames in FEC Data Frame): 1 1 0 0
T (Mux Data Frames over sync bytes): 3 4 0 0
R (# of check bytes in FEC Data Frame): 0 0 0 0
S (ratio of FEC over PMD Data Frame length): 0.3800 0.9965 0.0 0.0
L (# of bits in PMD Data Frame): 4463 289 0 0
D (interleaver depth): 1 1 0 0
Delay (msec): 0.9 0.24 0.0 0.0
INP (DMT symbol): 0.0 0.0 0.0 0.0

Super Frames: 66617 60274 0 0
Super Frame Errors: 0 0 0 0
RS Words: 0 0 0 0
RS Correctable Errors: 0 0 0 0
RS Uncorrectable Errors: 0 0 0 0

HEC Errors: 0 0 0 0
OCD Errors: 0 0 0 0
LCD Errors: 0 0 0 0
Total Cells: 45475259 1570908 0 0
Data Cells: 375514 52287 0 0
Bit Errors: 0 0 0 0

Total ES: 30 4294967290
Total SES: 18 0
Total UAS: 202 4294967195

[#15]

That's brilliant, it just needs your Current Line speed (Login required) to be updated.