Having had a quick hunt about, it seems that at least five are now with rolling stock hire company Eastern Rail Services, who already own a number of air con mark 2s:
http://easternrailservices.co.uk/fleet.htm
Mark 2F Lounge Cars: 6700/6703
Mark 2E Seated Brale Cars: 9800/9807
There's also a Mark 2E BSO in Caledonian Sleeper livery, 9497, which I wasn't previously aware of: What's the deal with this vehicle? Was it used as a stand in on the Fort William seated portion in recent times? They were using an Intercity liveried brake vehicle, 9513 I think, on this working for a while.