That time of year again

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Across
  1. 5. Famous albino gorilla falls from the sky during winter months
  2. 6. Collect this for the nativity scene and Stirling and Kate will be proud
  3. 8. If there aren't any left I'm afraid the product/item is sold ...
  4. 9. Get into the christmas one and forget the ghost
  5. 11. Steps of procedure which you must follow to qualify, set by governments and businesses
  6. 15. Pull this with someone during the festive season
  7. 16. A tasty game-bird alternative to turkey
  8. 18. Good future to all men!
  9. 19. It's so cold and absolutely outside
  10. 20. A greedy Charles Dickens Christmas character
  11. 22. The day after Christmas please don't punch me
Down
  1. 1. You may need to cut the branches a little
  2. 2. muscular ..... You aren't comfortable with
  3. 3. Suffer from this and you'll always be timid
  4. 4. Pop one of the top of the tree, You might become one next year , wish upon it
  5. 7. Deck the halls with this popular seasonal shrub this year
  6. 9. Hang it at the foot of the bed and wait for the prezzies!
  7. 10. Have you got these hanging off your nose this year? Frozen water formations
  8. 12. We wish you good ones , good old English news
  9. 13. The Christmas tree's shiny balls
  10. 14. UK glam rock band wished you a merry Christmas back in 73
  11. 17. Ask for your money back and get one
  12. 21. Don't forget to spare some food for flying Mister red breast, Batman might get angry