tbf, Falklands seem to be more complex than Britons consider to be the case.
I agree with Corbyn on the issue that self-determination cannot be the full picture. For example, I can't think that it's right that a nation can take forceful ownership of land, settle its own people, then claim that we should respect the citizens' self-determination. This is what's happened with the Falklands, the only issue is that there are 180 years worth of settlement of Britons on the island to consider. It leads to the question of what is more important - the desires of the population who arguably shouldn't be there in the first place, or the legitimacy of ownership of the islands, meaning re-visiting the events of the 1830s? I don't know to be honest.
Talking about the issue can't hurt. Opening dialogue would be for the best. If our claim is strong, there is little to worry about.
That being said, this is gonna go down like a ton of bricks with the public. Corbyn needs to pick his battles a bit better.