In reply to:
Having to pay up to 11 months' subscriptions for a package I no longer want is not fine, in my opinion.
That's the way that "retention" contracts work - it's also the way a lot of ISPs work with their standard contracts - my former ISP (Pipex) being a case in point.
At least with the PlusNet offer the choice is yours and nobody is forcing you to make this commitment. I left Pipex ( after over 5 years) because the only way they'd upgrade me to Max was to accept a new annual contract and there was no way of knowing what I'd actually gain.
For the life of me I can't see that anyone is having the wool pulled over their eyes with this deal - mind you, there are none so blind as those who don't want to see