Thanks for all your replies!

Ok, so it seems like the piece is certainly difficult enough.
Apparently byt the looks of the score, it's not that difficult - besides some rhythmic issues and 5 minutes of tremelo at the end. However I know of a few people who have been warned against playing it so I'm guessing the difficulty must be somewhere esle besides technical..
Yep, the score really doesn't look too complicated. Looks are deceiving...
Perhaps asking whether this piece was difficult enough was a rather obviously answered question, but I have to write to the examinations board for them to approve my programme and I really didn't want to spend time learning a new piece and then have them reject it because it 'wasn't difficult enough' as this has happened quite a few times before. I thought it would be good to get some opinions before I started learning it. Not that it's not good to learn new repertoire, but I do have a time limit (up till the end of the year) and really need to finalise my programme so I can start working properly on the pieces - intepretation, ironing out the technical bits, etc.