I had 0.8/0.25 in my house in Norwich. NEw nte with SSFP got 5.3mb
For something like a BBC I-player video steam non HD with say a e-mail page open you need at least 1.5 mb for one pc/laptop etc
Multiply this by each user who maybe on line, deducting the difference between the connection to the exchange and the online steaming from your provider at a busy time such as from pm week days (kids getting home from school and hitting the net on mass with businesses still busy as well)
My parents had 0.5mb ish, sorted the starwiring & the HR in the BT16. 4.5mb They got FTTC & 38mb. Way way more than they ever utilise, Just wish Skype (picture fair, sound fair-poor) or Facetime (great picture, sound intermittent) would keep up
Here in Colorado we originaly had 1.1/0.3. sorted the star wiring we get about 3.5/0.4. the deduction for the isp service can be a huge chunk of that. About 4.5km line lenght. No fibre and no hope of any.
Our ealdest likes his online gaming, If we have a hd vid to watch that will about use up everything to the limit and maby a bit beyond. Never mind any one else going on line. Its also worth bearing in mind when they say how many in the US have broadband. An ISDN at any over .01mb is classified as Broadband here. Where as in Europe it's classified as Mid Band. 0.5mb being the threashold.