First of all, I would recommend Virgin Media to anyone who can get it. BT has fantastic broadband coverage, however the old technology of copper wires means you get a watered down version of what your phone exchange can handle. This is of course if you live more than a stones throw away from the exchange. Fibre to the cabinet (FTTC) with BT will help. With 40mb estimated being at least over 12mb when it actually arrives in the home/office, but it is still running the last mile or 2 via the copper line. Vigin Media (at great expense) run a fibre cable to the street, then coax cable to your house, so the line can handle as much as they can currently give us.
VM have just increased upload speed from 1.8mb to 5mb for free, with 50mb download soon to increase to 100mb for another £10 a month. Upload speed directly effects things like sending emails, uploading to websites, hosted solutions like our helpdesk, remote desktop and particularly useful when working with attachments on Outlook Web Access.
BT has fibre rolling out across east and south of Aylesbury, but Rabans Lane and most of the Industrial areas near Fairford Leys will suffer on with basic ADSL1 solutions as BT has had technical issues that side of town. It is without question in BT’s best interest to focus their attentions at the home internet market, as they represent the same sort of monthly income, but unlike business clients, they can also cross sell them to phone and TV packages. How things have changed in 10 years!