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Across 1. The highest point; a meeting of top politicians 5. You might get this when a pipe bursts 7. An error; a fault 11. Something that is used as a drying agent 12. Strengthens sound 14. This flattens tarmac on a road 16. Long lasting 19. Two times the radius 20. Someone who travels and works in space 22. Dangerous 27. A major repair or renovation 28. A price offered for a job to be done 29. The sharp part of a knife 30. The answer to something

Down 2. A motivation to do something 3. Next to 4. A measuring instrument, e.g. for pressure 6. A person who takes over from or follows on from another 8. This sends a signal 9. To get worse; opposite of improve 10. An electric magnet 13. To pull something to make it longer 15. A three-sided figure 17. An error in a computer program 18. Bit by bit; one step at a time; slowly 21. A support for a bridge; a heap of things 23. To get smaller or less 24. A range of different colours produced when light passes through a prism 25. This is spherically shaped curving outwards 26. This stops something from heating up