I had Orange BB and talk (line rental). When I obtained my MAC the accompanying e-mail from Orange stated that the MAC would be ineffective if I did not first transfer the phone rental to another provider (presumably as Orange do not offer line rental without broadband). As I tried to use the MAC to transfer both phone and to get fibre broadband with Plusnet, the order became stuck with OpenReach and nothing happened, presumably for that reason (though I made them aware of the issue).
I assume that because Sky are full LLU, no MAC is required, so Openreach are not involved except to disconnect the Orange service, therefore the broadband order went though. Based on my experience you should be able to get Sky rental though a warning: line transfer takes 2 weeks by OpenReach (because of slamming rules, I think). I hope therefore you don't hit a timing problem: I'd specifically mention this to Sky and get their confirmation you won't be charged.
In the end I gave up on Plusnet after a fortnight of inactivity, ordered IDNet line rental, and once the line was transferred 2 weeks later placed the broadband transfer with the MAC which went through without any problem. A fortnight later and Orange haven't caught up yet, even though I've told them on the day of transfer (and cancelled their DD of course, vital).
For anyone else on Orange phone and broadband I think it's important to understand this point, which Orange don't make clear in their usual garbled marketingspeak.
Edited by smurf46 (Fri 12-Aug-11 15:29:55)