From searching, its Wednesday and Thursday for Nights, as Thursday is a Normal Bank holiday, and Friday is queens jubilee (special), So from the way it works for nights according to colleague helps is:
"it’s the Thursday night is the “special bank holiday” as the majority of the hours for Thursdays shift fall on the Friday."
taken from yammer, as i said in a previous one, this is another post about asking and a confirmation.
Thursday being a normal bank holiday comes out of holiday entitlement and follows normal holiday procedures of may be required to work if not enough unless joining before X date, so Wednesday would be that for Nights while Thursday is the day for nights.
annoying if you want to be out all friday etc so become ill people. lol
as for christmas the same information with the paid abscences information said about falling on sunday 25th, so its a "Normal day", and they move it to tuesday 27th.