Lockdown Cryptic Crossword

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Across
  1. 1. Heads of Department concerning umbrellas will keep you clean on site
  2. 4. Not with former partner, start of generation software
  3. 7. Early Notification finishes for protective measure
  4. 8. Cut end off rose, give to Personal Assistant for Charitable Organisation
  5. 12. small remit helps identify fibres
  6. 15. Truth Speak it to power, it's our conference after all
  7. 16. Doc with IV randomly causes pandemic
  8. 17. Query morning abbreviation with head of Sales finding the last ones to join
  9. 20. Where we work Lucy loses tail and gains charged atom
  10. 21. Receive around question in pipe joints
  11. 26. Gate and shed holding head of Axe for key location
  12. 28. Strange, I'd circle too for blue asbestos
  13. 30. Victoria in youth lodging initially shows a type of tile
  14. 31. Written words with you and communist covering a bobbly material
  15. 33. United Kingdom with head of America and Switzerland form important body
  16. 34. Confused cult sing on for part of business
  17. 36. Combine Thorium, Erbium, half portion of Magnesium and Aluminium to create insulation
  18. 37. Preparing yourself for the big event, undertaken in a classroom
  19. 38. Part of our business muddles rain in me
  20. 39. Falling behind to cover pipework
  21. 41. Starting Players Physical Education protects key workers
  22. 42. Survey type: Show illuminated charged particle
  23. 44. Peppa's not young in this office
  24. 45. Sounds like tears,
Down
  1. 2. Decor on amusingly hides virus
  2. 3. Steers horse to sports lesson, missing start of the action. Dutyholders should do this every year.
  3. 5. Queen upset over tainted Edward intially, a cost for doing business
  4. 6. Decorate me with tops of Northern Trees for survey
  5. 9. Texas' Best Osprey hiding carcinogen
  6. 10. Anyone in a stom Al, you can access it online
  7. 11. Kier's party without you standing next to a conservative? Analysis here
  8. 12. Initially awake sore in Milton Keynes, required when sampling
  9. 13. Tolkein creature behind some of graveyard, hard material
  10. 14. Divide and hide face protection
  11. 18. Half of aussie rockband gives praise to a
  12. 19. Head of Large snakes helps surveyor reach new heights
  13. 22. Regarding where ships sail from, they tell you what you need to know
  14. 23. Compact Disc Music initially needed on construction projects
  15. 24. Bite end off you and men, it's sticky on the floor
  16. 25. Bad blue go randomly to contain samples
  17. 27. Internal war with South for part of our business
  18. 29. gain insult confused type of board
  19. 32. name tv line Ron, confused? it's all part of the business
  20. 35. Head of Fine Upstanding Locals mix with rough to stay at home
  21. 38. Man with net game randomly produces a survey
  22. 40. Most of Company has mixed lace for legislative agreement
  23. 43. Randomly atomise brown fibre