I mean, boffin: fine. Everyone in the UK knows what that means. But britland isn't a term that anyone in the UK has heard of. (Testing...)
So pretty much anyone for whom the news is relevant would understand the headline immediately.
It sounds like it was a successful title. Click obtained.
I bet that makes the BNP/UKIP/Blackshirts/Reform/Tories suitably angry.
And I imagine the Blackshirts, or whatever we're calling this current version of Nazi morons would think you meant it to suggest, as they believe, that "their" country has been overrun by foreigners.
† In Ireland a Unionist wants Ireland, at least part of it and in many cases all of it, to be "united" with Great Britain. Contrariwise Nationalists want all of Ireland to be a single uh, independent nation. These groupings correlate to varying degrees with which flavour of Christianity (if any) you practice, and with whether you want a Republic or Royalty. The trivial stereotypes would be a Protestant who wants the King of England to also rule the entire island of Ireland, and a Catholic who believes the entire island should be an independent Republic. One thing almost everybody appears to have agreed on is that murdering each other wasn't solving anything. So that's good.