Here are the Christmas postal deadlines. I’d advise leaving a little longer than this though if you can!
Wednesday 3 December – Asia, Far East (including Japan), New Zealand
Thursday 4 December – Australia
Friday 5 December – Africa, Caribbean, Central & South America, Middle East
Monday 8 December – Cyprus, Eastern Europe, Greece
Tuesday 9 December – Canada, Poland
Friday 12 December – USA
Saturday 13 December Western Europe (excluding Greece, Poland)