Hmmm, that does seem a little tricky to find!
From the our website navigate to the fibre pages, click the hyperlink for the fibre FAQ and then under question 8 you'll find:
8. Is traffic managed?
Like all our broadband services, Plusnet Fibre traffic is managed on our network. This is to guarantee all customers get a good quality and sustainable service. For more information read our Guide to Traffic Management.
From the 'Guide to Traffic Management' page, click the
Broadband Experience hyperlink and then
Upload Speeds hyperlink (it's at the bottom of that page).
Then give yourself a medal
I'll see if this can be made more prominent...