I've been trying to understand what's going on with this case. My understanding so far is that the reason the UK govt is not granting him safe passage out of Britain to Ecuador is because he has now committed a criminal act in Britain, namely skipping bail for the court hearing about his appeal against extradition to Sweden. As I said before, I applaud his Wikileaks work. We need people to reveal the dirty dealings of national governments. However, if the sexual assault charge in Sweden is real (some people think the US is behind that as well!), he most certainly should go on trial for that in Sweden. Under the UN human rights convention Sweden cannot extradite him to the US for espionage, so what's he afraid of? Going to jail for a crime (allegedly) committed in Sweden, or being extradited to the US on some other trumped up charge that wouldn't carry the death penalty (or the possibility of being banged up for life)?
We don't have enough information to know.
But it seems the UK govt is not being as unreasonable as I first thought because, now that he has skipped bail here, we cannot legally give him safe passage to another country.