Alex's tricky words

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Across
  1. 3. 20th century Fox minus 8.
  2. 5. Tired like car fumes.
  3. 8. Your dad's dad's daughter's child.
  4. 9. The I of MI5.
  5. 12. It has a good beat.
  6. 13. It's none of yours.
Down
  1. 1. David Cameron does this.
  2. 2. Turn on your TV and you'll see this.
  3. 4. Cadbury's make these.
  4. 6. If at first you don't succeed.
  5. 7. You need this for a TV.
  6. 10. Never eat cheese, eat salad sandwiches and remain young.
  7. 11. Doughnuts have a hole or jam in this.