Hi
Not much of a help but I left PlusNet because of congestion issues and the annoyance of having to know the in's and out's of their gateways to hop around them, that was years ago before FTTC! Nothing has changed in all this time.
It seems to be a cycle, it's okay for a bit, probably because of a combination of a bad spell causing customers to leave at the same time they try and tweak the platform and add more capacity in desperation to dampen the complaints on social media sites, so it works for a bit until the next 6 months half price promotion.
It is PlusNet's model, they run to full capacity and then some, so it takes very little change in usage for it to all start falling down, how else are they so cheap?
I'm with Xilo now, it is around 3 times the price PlusNet charge for FTTC, however for that I'm getting a service 100 times better, never slows down even at peak times and nothing is traffic shaped, no gold or platinum queues or other such concepts, just everything at full line speed. I wouldn't expect that service at PlusNet rates, they just can't do it.
Regards
Phil