I was trying to find out how much I was using but Plusnet don't tell me these days.
Windows said that I used about 30 GB on my laptop. There must be several more GB on my phone and tablet.
The big guzzler will be the smart TV though. I stream about 2 hours worth of HD a night which is probably about 180 GB in a month.
So my guesstimate for my usage would be 210+ GB a month!