>> Called the UK Online tech support line, and an affable Belfast man switched me over to 2176 kbps in about 10 seconds.
Glad that got sorted... mistakes do happen, but the advantage here was that you spoke to UK support who at least was able to correct it. Ive seen similar happen with other ISPs can it can be a nightmare to get their support to understand the problem... nevermind correct it promptly.
Those stats actually look quite good for your line length and show that at the time you took those stats that the line could actually handle faster speeds.
However, it would perhaps be advisable first to is you say monitored the SNRM with router stats to see how much the SNRM fluctuates over the course of the day.. and/or over a longer period.
But a SNRM of 18dB would point to that line having at least approx another 1600 kb in it.. maybe more if it was stable.
The only thing is, is because the line is long then it may need a higher target SNR... and less bits are more likely to be loaded at the higher frequencies.
But as it stands.. that line looks good.
Its worth pointing out to others that iirc the 2Mb package was chosen specifically because it was better value on a line that may not be able to support that much more. The line had an unknown record previously only having had dial up.. and stability and support is considered more important than pushing the line to its maximum with all the possible problems that that could bring. 2Mb speeds after years of dial up is going to seem like the op is flying.
It was unfortunate that mike had a few teething problems :/ but UKO do seem to have a continued excellent good track record when it comes to what they do and their support at least seem to be about one of the better ones when it comes to sorting stuff out.