Denmark: Flip between Social Democrats and Social Liberals. Probably the former though.
Estonia: Social Democrats, but I'd vote Centrists in a general election.
Finland: I guess the Green League, to be frank.
Ireland: This is a hard one. Fianna Fáil and Fine Gael are basically patronage parties with no real reason to exist, Irish Labour is effectively useless, Sinn Fein are dodgy, the Greens are dead.
I'd go Independent.
Latvia: Harmony Centre (Latvia has really cute names for its parties. It's adorable.)
Lithuania: The Way of Courage. I'm all for crazy scrappy new parties with crazy names.
Sweden: Eh, Green party I guess.
UK: I am going to vote Labour (I'm in Yorkshire and Humberside constituency). I would vote Green or Health Concern if it was a national list
Northern Ireland: Alliance or SDLP. Probably the former.