Happy Christmas!

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Across
  1. 2. / Who is solving this puzzle
  2. 4. / type of motor racing
  3. 7. / being one more than one
  4. 9. / chemical symbol for astatine
  5. 10. / 5 x 4 plus half of a quarter
  6. 12. / racetrack
  7. 13. / To possess
Down
  1. 1. / month named after a Roman emperor
  2. 3. / 5 x 4 twice
  3. 5. / one of several international races
  4. 6. / being one more than one but spelt differently
  5. 7. / Lottery
  6. 8. / Citizens of the UK
  7. 11. / fill in ... blank