So not sure if this is widely known but I just added Disney plus to my sky package via my sky q box expecting to pay £7.99 per month. Showed up as £3.99. When I checked my sky app future bills show Disney plus as £7.99 but my Ultra HD cost of £4 has been discounted by £4 so now free.
May be of use if others have Ultra HD and want Disney.
By the way I didn’t see this advertised as an offer so was pleasantly surprised.