I just bit the bullet and cancelled my line with Sky. I went over to Plusnet, who did the whole install free of charge (due to the migration issues), new line, BTOR box etc.
I have Sky and Plusnet running together at the moment until the 11th Apr when my line with Sky is finally ceased (so no loss of service). Nice of Sky to let me go free of charge, 4mths into contract, due to the well known issues with them.
Changing phone number was not a problem for us, as we never really used it anyway.

When I signed up to Sky Fibre, it was a new product not yet detailed on their website as I was part of an advance group who registered their interest in the product - hence no terms/conditions were available and at the time all info about terminating/downgrading was given over phone. My ADSL downgrade order has been actioned and I have the name and agent ID of the staffer who was adamant he would call back and remove the early termination charges, so fingers crossed.

I'm not sure that clause has been changed since fibre launched, as "Sky Broadband" can apply to ADSL as well as VDSL. So equally someone with ADSL can't cancel their service and keep the landline.

That is true, however once I have the ADSL back on the line, I can just let PN know and they can then do a simultaneous order and migrate my services away from Sky.

I get the feeling that Plusnet are getting an awful lot of recent custom, because of Sky.
I hope they can hand the influx of digital refugees.

Just to report back that a few weeks on I have a result

Downgraded from Sky FTTC to Sky ADSL which took 10 days to action. Phoned Plusnet within 10 minutes of downgrade happening and they pushed through the simultaneous order for phone + FTTC which this time was accepted, seems the line tags updated near instantly. 14 days later here I am on Plusnet Unlimited Fibre without any internet downtime and very happy with my speeds. Much praise for Plusnet customer service and responsiveness along the way.

http://www.speedtest.net/result/2683770321.png

Well planned (by you) .

lgb2000 - im in two minds between Sky and Plusnet,

Can you tell me what you thought about Sky's Fibre? or was this solely a cost saving move.

If you are "in two minds" then do you really want to go down the route of MPF and end up in the same mess as the OP?

Sorry not that tech savvy - what is the MPF route?

I'm currently on O2 and was considering Sky Fibre Pro or Plusnet Unlimited Fibre ( while keeping my existing line with BT)