Just thought i would update you all on real life BT FUP experience
I have downloaded over 600GB on my BT FTTC connection, and the last 30 days i have been restricted as per their FUP.
I did get warning emails at 240GB
BT restricted me to 2Mbit dead on 5pm until midnight weekdays, weekend was full speed.
Did not really affect me as i downloaded at all other times.
Hope that is of some use to people when deciding on FTTC ISP's