I've found this on their website
http://help.orange.co.uk/orangeuk/com.instranet.Inst...
Their T&C state that they have removed their FUP (which used to be 75gig p/m if I think right?), but the above document says they throttle P2P and newsgroups. I can't see anywhere which they state by how much.
It is of my understanding that Orange monitor the 'usual' ports that are used by P2P/newsgroups and throttle those depending on how much traffic is actually going through. I am being careful here as I do not want to contravene any forum rules (apologies if I do), but there could be ways and means around this, if you catch my drift!
My understanding from others is that P2P speed can sometimes drop by over half but this can happen with any ISP who monitor this kind of traffic.
I used to be LLU'd on Orange and received an email with a date of when I was being moved over to WBC/21CN. There was about 15mins downtime. There is no 10 day 'line training period' when someone goes from 20CN to 21CN whilst with the same ISP during this time, but may experience a bit of speed fluctuation whilst a happy medium is found for a couple of days or so. Some people don't notice a huge difference in speed, maybe 1-2Mbps at the most. Some people have noticed a significant drop in speed when being transferred from LLU but this is because their exchange hadn't been upgraded to 21CN at that time. It may be worth you ringing Orange to see if the 21CN date is correct for your exchange and if you are still considering changing to Orange, do it from that date. I'm not sure, but you may have the 10 day training period as you are moving ISPs, but Orange should advise you if this is the case.