I had a similar dilemma when doing my aero eng course at manchester. After the first year I thought whats the point there was very little to do with aircraft and it was a very tough degree. My advice would be to stick it out. On any engineering degree the first year is fairly common and failry generic as there are fundamentals that just have to be tought. I found the course got much more interesting in the second and especially third year. It was a hard slog but I am glad that I stuck it out and got a good degree behind me.
Another alternative would be to transfer to one of the aviation degrees now being established across the country, the ones i know of are at Leeds, Salford and Cardiff.