I've just tried searching for this information, with no success! You should certainly assume that the lines will be closed on 24th,25th, 26th + 27th Dec as the first is a Saturday and the others bank holidays.
The same will apply to Sat 31th Dec, Sunday 1st Jan and Mon 2nd Jan.
Other than this, I'm afraid you have as much information as me.
Nothing on this board constitutes legal advice - always consult a professional about specific problems
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