I have since found out that my friend had used a rubber mallet and a Hollowtech II tool to get the old BB cups out. He said that they were seized in there, so I am guessing that the hammering of the tool and BB was the cause of the threads getting twisted and messed up. He said that it took a good while and a lot of force to get those cups out.

The frame is back with me now, so I can go about adding all the components and new cables etc to the bike.

Thanks for the replies folks. Always interesting.