Just saying hi Chris. Long time no see hope that you are well.
Currently average about 40gb/month, mainly streaming content. Would possibly stream more if the service was up to it! Not sure what that is classed as.
Sounds similar to mine, usage shot up after getting fttc, although that could in part be due to much more streaming content available and being able to use HD. I dont know what my monthly usage is now as the Plusnet VMBU is broken and doesnt record my usage (they say doesnt matter as Im on unlimited), but I think last time I looked it was about 80.
As regards to congestion, there has been some localised issues with the BT SVLANs, but touch wood most of those seem to get resolved fairly quickly. It doesnt take them months like it used to with the old VPs. I used to pay a bit more for max premium but have never bothered when on fttc.
I have seen some issues which seem more related to the BTw MSILs (manchester and a couple of the london ones) those took a bit longer to be fixed. The worst episodes used to be the usual peak evening time when my speeds could go down to 20-30Mbps. That said multiple threaded stuff would go through at line rate, so it wasn't even obvious on some speedtesters.