So DD hasn't seen her dad since beginning of March due to lockdown. He doesn't live locally, in fact - in another country 
We are in Wales, he is in London.
DD really wants to see him, he really wants to see her - she is year 11 so has no school to return to anytime soon and as the lockdown in Wales is stricter than in England she literally hasn't left the house except for an occasional dog walk.
So how would I go about getting her there? I know the rules allow for transporting kids between parents houses but does this still apply when it's in different countries? I've looked on the gov website but can't see anything specifying between countries.
She could get the train solo as she has done many times BUT I'm a little concerned she would be questioned by train guards etc and she's quite shy. So is my only option to drive her ?