Ali's Birthday!

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Across
  1. 4. Feiern Sie heute! (10)
  2. 7. Bat species, "eel tipplers" anag (11)
  3. 8. Player with most points scored in English Rugby Union (9)
  4. 13. Who won the rugby world cup in 1991 (had to age you by a year, sorry) (9)
  5. 16. Struts about in polkadot (4,2,3,9)
  6. 17. 4,6
  7. 19. Wallabies like to play (5,5)
  8. 20. Host of 1972 summer olympics (6)
Down
  1. 1. Welsh town, birthplace of Henry VII (8)
  2. 2. Potato, informal (4)
  3. 3. A bear that's not a bear (5)
  4. 5. Fastest speed this boat can go (3,4)
  5. 6. Curious about fliedermäus (16)
  6. 9. Fauna (8)
  7. 10. Part of a washing machine (4)
  8. 11. Enclosed pastry dish (10)
  9. 12. Home from home (3)
  10. 14. "New World" (5,7)
  11. 15. 'funky ____' 1975 hit by the Goodies (6)
  12. 18. It gently weeps (6)