Oh boy, when will people learn!
Sorry, bad day of Broadband issues. Orange is just another discount house who owns NONE of the infrastucture. They rely on BT to have a decent service. If you cannot have it from BT, and Virgin has given you the bum's rush, I would stay away from Orange with a rather longer barge pole than normal.
The ONLY people to use for broadband are those who supply and own the physical cable between your home and the exchange. Anyone else is simply 'piggy-backing' their billing system on someone else's service.
I have been with most of the ISPs in this country and have ended up back with BT having had enough of the crap service that summarises 90% of the other ISPs in the UK.
Your choice, but be warned - if BT owns the line, then remember who ultimately has to service it.
SHARK!
For every positive action, there's an equal and opposite government plan.