Weird, maybe from England movie

This movie is about dragon slayers,and how two particularly inexpirienced fellows have to go to the ends of the earth to save the already crumbling floating planets (there are little planet like areas around everywhere, like balloons but gravity is slightly loose). On their way they expirience many beta dragons they can kill easy or avoid tough ones as soon as they can. For example, in one scene they were crossing a really long bridge with a runaway (princess?),which they are forced to deal with, and there are teeny tiny dragons all around them, but they swarm together kimda like bees and take a form of a huge deadly red dragon and attack them. They destroy most of the bridge but they manage to survive while pieces of crumbling building float away.
The movie is in color and i think i saw it around 2010

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