Well so far the overwhelming opinion is that yes they are Jumbo mugs and to leave the title as it is. I have asked a number of people to pick out the jumbo mug and 100% have gone for the 15oz one, which is the one two people are sying is not jumbo!
So I wonder if fleebay will agree as they have both opened a dipute with them, saying that they are not as pictured or described and not only want a full refund but want me to pay for them to be returned to me, yet they are exactly as pictured and described!!
I will keep you posted!