Yes mate if the sponsor doesn't want you to leave then you can't, it's happened to me when I was going on holiday a few years ago I got to the airport and he forgotten to authorize it so I was blocked until he went online and unblocked it.
I have been in a lot of contact with Julie Elliott our local MP but nothing is happening out British embassy are useless they have told me point blank there is nothing they are allowed to get involved with, my next step is the media, I have a new court date for the 12th of November but I don't hold much hope for that.
Absolute nightmare mate! Gutted for you. How many of you, all Brits??