I upgraded recently to medium fibre which was initially up to 35mps which was a huge improvement on the standard 2.5mps I was getting
this has dropped dramatically over the last week or so fluctuating wildly from less than than 0.5mps to upto 4 or 5mps but rarely more. web pages are now slower to load and more unreliable (often hanging for minutes or failling completly) than standard broadband which I had had for many years
since upgrading our email has also been eratic ( I have posted a separate message about this)