From the point of view of English law, contempt of court and breach of bail are entirely unrelated to why you are in the court in the first place. It doesn't matter if the prosecution withdraws the case (or, in an extradition hearing, the Home Office stops seeking extradition), you have not followed the will of the court.

I'd expect him either to be found to have been under effective house arrest for the period, and let go with a slap on the wrist, or be made an example of for running away to somewhere where the police could not enter, and sentenced to at least six months in prison (there's a maximum sentence of twelve).