HMRC on Twitter
So this is how they are disseminating information now:
One of the most important points is a view from HMRC Customer Support via Twitter that any holiday taken during furlough needs to be paid at full pay, not at 80%.
This may well be a change to what you have told your employees so far.
If so, I would strongly recommend waiting for a more official source to confirm this next week before communicating a change to all affected employees.
Other updated details from our friends at 360HR here.