Dear Mark, you may know these people :-)

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Across
  1. 5. A bit Rusty. Beat you to redundancy.
  2. 8. Dreadlocked operator
  3. 10. Don't teach this man how to suck eggs
  4. 12. War-buff
  5. 14. Is he STILL in the dumpster looking for copper wire?
  6. 16. Shh, don't mention motorbikes to him
  7. 18. Does he still work here?
  8. 19. aka "Major"
  9. 21. Loud and Greek
  10. 27. Stop this man from running on site!
  11. 29. 24/7 II
  12. 31. Master sudoku-ist. Not so great climbing gates
  13. 32. The #1 cricket lover in QC
  14. 33. Un-official title: Corporate engineer. Never happy
  15. 34. Why is the accountant managing the warehouse?
  16. 35. Most accident-prone maintenance guy on site
  17. 37. Your friendly neighborhood operator
  18. 38. She's the best welder you'll find in the garden
  19. 39. Had the fish tank in his office for years
  20. 40. He's probably busy plastering this weekend
  21. 42. He's the designated QC bouncer
  22. 43. 24/7 Bam Bam
  23. 44. Operator -> QC -> Flotation Chemist -> Where will he end up next???
Down
  1. 1. Needed some cheese to go with his w(h)ining
  2. 2. Only maintenance guy better at doing crosswords than you
  3. 3. Quote: "Um... Um... As you know, Um..."
  4. 4. Your best friend on site (or worst???)
  5. 5. "Big Red"
  6. 6. Twin. Younger???
  7. 7. New head smarty-pants
  8. 9. "Yarpy"
  9. 11. Was she the shortest person ever employed at Clariant? Mouth like a sailor
  10. 13. Sausage roll and chocky milk. Vest is best
  11. 15. Karate master
  12. 16. Mr. Safety First! Step back 5x5
  13. 17. Former partner in crime
  14. 20. Third generation Clariant employee
  15. 22. Clariant can't operate without her, that's why he's left and come back a dozen times.
  16. 23. Twin. Older???
  17. 24. He stole your job!
  18. 25. She can be a bit quiet in the lab
  19. 26. Your bosses older brother
  20. 28. Back in the day she always made sure you had your Milo
  21. 30. You're going to miss receiving pro formas from her
  22. 36. I.T guru. Have you tried turning it off and on again?
  23. 37. She'll be running this place eventually. Oh My God!
  24. 41. Winging, sweater knitting, Carlton supporter
  25. 45. Site psychiatrist - her offices are in the lab