Ooops!
All this time, and it's the wireless link.
I think there's been some recent stuff about Macs and wireless but I could be confused - they were talking about the Airport or something think.
The 582n isn't brilliant on wireless but used to give me over 35Mbps on a 52Mbps FTTC connection speed. I don't think it's as bad as what you are seeing, but at least now you know where the problem is

.
I suggest a new thread about your poor wireless speeds, as the
Subject of this one is now misleading. Your upstream is also bad on the wireless. Possibly in the Fibre forum rather than Plusnet, to get a wider range of readers/advice.
My broadband basic info/help site - www.robertos.me.uk |
Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. -
BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.