I think everyone has summed up fairly well but as stated above the back and shoulders also need a lot of work on top of the balance issues, sleeve pitch being WAY off, sleeves too baggy, sleeves too short, lack of shape in general in the jacket (thought it looks like there isn't much of you). The balance may have something to do with your posture though. It needs a lot of work, almost like everything has been built up and made bigger to hide your frame, make it look bigger than it is if that makes sense which doesn't need to happen to make a skinny guy look in proportion. I'd say GB would be mortified if he saw those pics on here, though I assume he looked over the suit at your final fitting?
Anyway good luck with it, I hope you can get it fixed because 1100 quid is way too much to pay for a suit that looks worse than many off the rack suits I've seen.