https://www.independent.co.uk/news/world/middle-east/turkey-erdogan-president-us-ambassador-visa-latest-a7993116.html
http://www.telegraph.co.uk/news/worldnews/the-pope/11527987/Pope-Francis-refuses-gay-French-ambassador.html
https://www.radionz.co.nz/news/national/254049/israel-won%27t-recognise-nz-ambassador
In a legal manner (and not because I'm a UK citizen) I presume the host nation can decline and then the proposing nation can find another one or send them anyway but risk that he falls foul of the law and the host country does not recognise any diplomatic immunity. In this case though, if the UK declines then he is still stuck in there with no way out.I think its kind of strange really that we have spent all this money pursuing this guy for what was a minor warrant (that they wanted to speak to him) which has since been cancelled and think that we (the UK) should just say enough already and turn a blind eye to him leaving on a jet plane. Oh yeah, but the strange part is that it really seems as if its important to somebody that that doesn't happen.
at worst it's a year in prison
Edit: delete repeated words
Although it would be unusual, impolite and probably unwise, if the UK decides to enter the embassy by force and just take Assange, there isn’t a whole lot Ecuador could do about it, apart from making a big fuss. Ultimately it is the UK who decides to allow Ecuador the right to have an embassy on their soil in the first place and they can come back on that decision whenever they want.
A host state may expel a diplomat, but may not remove/ignore their diplomatic immunity.
Of course, there'd also be the problem of other countries denying the plane access to their airspace. They're probably upset with him over his role in the Snowden event. https://en.wikipedia.org/wiki/Evo_Morales_grounding_incident
I'm a bit shocked at how brazen it is, honestly. Perhaps, if anything, it implies that Britain doesn't view Assange as a big issue anymore as doing what Ecuador did last month would almost certainly be viewed as a diplomatic slap in the face otherwise. It almost reads like their response was "haha--no"