I seem to remember that Plusnet default ADSL2+ to 448kbps upload, but happily raise it if requested by ticket.
Are you serious!? That's ridiculous.
It's just that my Dad is with Plusnet and i've recently advised them about a rogue 15dB noise margin on his good quality line.
He was still on ADSL'1' even though exhange was upgraded to ADSL2+ during his time with them, and they've only now after this ticket admitted there's "an issue with the provisioning of the line", so are regrading it. I remember asking them before if he could be upgraded to 21CN WBC as soon as it was available and they flat refused.
Anyway at least it's being sorted now but looks like i've got to raise a further ticket about upload speed. What a ball ache.