Remember when trying a new filter and/or router to look for the actual connection speed, not the attainable .

In reply to a post by chrispurvey:

It would certainly be worth trying another filter and also router to see if there's any difference.

After digging out my old Sky router and figuring out how to get around it being locked to them (it initially connected to them quite happily, which surprised me a bit), my stats are looking quite a bit better. My speeds have only improved a tad so far though, and I think interleaving is still probably on.

Downstream / Upstream
Line Coding(Trellis): On On
SNR Margin (1 dB): 3.2 12.4
Attenuation (1 dB): 7.5 4.6
Output Power (1 dBm): 21.2 12.2
Attainable Rate (Kbps): 22808 1440
Rate (Kbps): 19661 828

BTW speed test:

Download speed achieved during the test was - 15.24 Mbps
For your connection, the acceptable range of speeds is 4 Mbps-21 Mbps.
IP Profile for your line is - 17.35 Mbps

Plusnet current line speed:
16 Mb

Is there anything more I need to do, or will it just nudge itself up on its own?

That certainly looks better, I've also just placed a reset on your line and this has removed interleaving and increased your upload and download slightly.

Your downstream is now at 20024kbps and your upstream is 1152kbps.

I've also updated your speed profile to reflect the difference, do you want us to arrange another router to be sent to you?