[JAS84]

I think you’ve missed my point. Which is that and I’m assuming it’s not been sold as the UK hosting on behalf of the previous winner.

The two 1970s cases were the winning country's broadcaster asking the BBC to replace them, which isn't in itself that different to this year. I think the difference this time is that Ukraine didn't choose not to host it, they didn't voluntarily forfeit the hosting rights, it was deemed unsafe to have the ESC in a warzone, so they invited the runners up, the UK, to host in their place.