Cheers, will leave it for now then

Changing ISP isn't too much of a worry as can just Return to Donor, taking a 12 month voice contract, and use my other line while I wait for DSL to activate with new ISP.
I'd imagine it's doubtful that Sky install both a DSLAM and an MSAN in newly activated exchange...surely they use an MSAN even for broadband only?
But, should I rethink and change my mind, is it possible to stop my PSTN going to Sky but keep the broadband order going?
AAISP via 2x20CN, moving one to
SKY Unlimited