So they will be Unionist about Northern Ireland?
Labour don't stand candidates in NI so the comparison with Scotland isn't really relevant where they do have candidates and MPs etc. But regardless, no I don't believe that Labour supports a united Ireland as a point of principle.
And not want a 2 state solution in Palestine?
Are you really comparing the situation in Palestine with Scottish independence NS
Wrapping yourself in one flag as opposed to another doesn't make you internationalist.
And what 'national' flag does Labour wrap itself up in NS. I know they have been a bit more willing to embrace the Union Flag recently, but over the decades Labour have often been criticised for not wrapping themselves up in the British flag.
You'll no doubt be aware that Labour do wrap themselves up in a flag - traditionally singing of it at their conference - that flag is the red flag of the international labour movement. That is all about internationalism, not nationalism.