A relative of mine has had Sky Fibre at a non-LLU exchange for a few years now, it works great. Their voice service is provided by Sky Talk over WLR3.
On non-LLU exchanges with FTTC, Sky wisely will not offer their BT Wholesale based ADSL product (if it even still exists), but they will offer fibre.
The only thing you miss out on is the (excellent) Sky Talk Shield call blocker, as this requires Sky hardware at the exchange.
Edited by Oliver341 (Thu 15-Feb-18 13:43:55)