Cheer up, buttercup

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Across
  1. 3. Greek goddess of love
  2. 5. Home of LCFC
  3. 8. Public transport, usually powered by electricity from wires above it
  4. 14. Capital of Iceland
  5. 15. Famous rock formation in Norway, translates to 'troll tongue'
  6. 16. Tidal island in Cornwall
  7. 18. A squat thrust with an additional stand between repetitions
  8. 19. Character Meredith '____' from NBC's The Office
Down
  1. 1. Surname of the fictional detective in Jo Nesbo's scandi noir series
  2. 2. Title of Radiohead's debut album
  3. 4. Tropical fruit with a leafy top
  4. 6. American hip hop super-duo
  5. 7. 1999 thriller directed by David Fincher
  6. 9. Greek god of war
  7. 10. Character Ben '____' from NBC's Parks and Rec
  8. 11. Popular, affordable UK hotel chain
  9. 12. What Holly wants to grab in a lift
  10. 13. Popular instant-messaging client developed by Microsoft in 1999
  11. 17. Animal on the Californian state flag
  12. 18. Title of The National's 2007 album