There's a website called SamKnows (
SamKnows - Accurate broadband performance information for consumers, governments and ISPs) that has a UK Broadband Availability Checker.
I put in a random morayshire postcode of IV30 6YA and it seems to think both TalkTalk and Sky LLU are in your the morayshire area.
But you might be at one of those unfortunate exchanges out in the sticks where BT still has a healthy monopoly. I really hope you're not in one of those areas though !
TalkTalk isn't that bad, but I've always found the Easynet network (on which Sky operate) to be consistently better.
I haven't looked at the commercial side of Sky's offering, so you'd be well advised to check the usual suspects of contention ratios etc before signing up.