BOLD = GOOGLED
Guessed two more before Googling - so 8 out of 20
1. ARDENNES 2. Nautical 3. Miss Money Penny 4. Alcohol 5.WALKER 6. VETERINARY SURGEON
7. DECEMBER 3RD 1984 8.ANGLIA 9. Butterfly 10. 12 LUCKY GRAPES 11. Never 12. EIGHT 13. ANCIENT GREECE
14. Six 15. Kevin 16. UKRAINE 17. GERMANY 18. New York 19. Noddy Holder
20. Kissing under the mistletoe was a way for women to protect themselves from the bad luck of remaining an old maid or not receiving a marriage proposal for the following year.
Looks like I take after an albatros