Across: 1. abridged version, 9. rampage, 10. mariner, 11. pin, 12. bastinadoes, 13. love affair, 15. isle, 18. sunk, 20. siamese cat, 23. micromanage, 25. sea, 26. dongles, 27. guiding, 28. cross-fertilised
Down: 1. acropolis, 2. Romanov, 3. dead-beat, 4. evens, 5. vampirism, 6. reread, 7. igneous, 8. nerds, 14. fricasee, 16. estranged, 17. especial, 19. no can do, 21. Cassius, 22. oodles, 23. medic, 24. argot