Win a PiZero or PiZeroW

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Across
  1. 4. from this a mighty oak will grow
  2. 6. new out of the box software
  3. 9. Rubus idaeus
  4. 12. 11.8 inches
  5. 13. pi topper
  6. 14. used for scale
  7. 15. there are over 5500 of these in the UK
  8. 17. picture element
Down
  1. 1. where baby was born
  2. 2. General Purpose I/O
  3. 3. where you would go to learn black belt programming
  4. 5. Location of the Mathematical Bridge
  5. 7. what you do when you have an itch
  6. 8. my engine has frozen
  7. 10. Rhymes with Cabbage
  8. 11. diet pi topper
  9. 16. 3.14