In the Plusnet Community forums on Friday Chris Purvey said the problem had been fixed. It appears it has, at least on FTTC.
I was upgraded this morning from Extra Fibre to Unlimited Fibre and retained mine.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 54.0/14.9Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.