Know your colleagues

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Across
  1. 5. The Serpentine is a famous one in Hyde Park
  2. 6. The name for a voting area
  3. 7. A very reputable brand of bicycles
  4. 8. Not your Scottish Nephew
  5. 11. A Greek island
  6. 12. Not 'goings'
  7. 15. Seek and ye shall find
  8. 16. Oliver Twist asked for this
  9. 18. Worth 4 points in snooker
  10. 19. Cayenne?
Down
  1. 1. A singer with this surname had a hit called Fast Car
  2. 2. A clothes shop
  3. 3. Best person to land your lunch
  4. 4. ....... a method for calculating the surface free energy of a solid from the contact angle with several liquids.
  5. 9. Not just a way of cooking eggs
  6. 10. Not Sasquatch
  7. 13. Saturn has 62 confirmed ones
  8. 14. Doctor Livingstone I presume?
  9. 17. Teresa would be a bad name for this lady