Not seen this in any shops, but my girlfriend and I had a piece each in a Beefeater on Thursday. It's really gooey and chocolate fudgy at one end with real Jaffa cakes baked in the cheesecake and the whole thing is drizzled in chocolate sauce. Also tasted deliciously orangey. I could have had two portions but needed to leave room for coffee.
Thanks I'll make a note of that.
Note to self: Sometimes the cheesecxakes and pudding which you have in restaurants are not always avaliable in the supermarkets