Across
1. Something done quickly (5,3,2)
6. One has the right to enjoyment of property (4)
9. An assembly of people in disguise (10)
10. From stem to stem it's sounding a canal (4)
12. Leo bairn diet? Spin giving consideration (12)
15. First House of Commons Speaker, lived in Thames Ditton (6)
16. Suggestion from Pop, solar power conversion is the solution (8)
18. Great fear; shocking (8)
19. Varieties of quartz with markings (6)
21. Timber leaned, crashed, became subject to an ending (12)
24. He discovered Greenland in about 982 A.D. (4)
25. Constitution guaranteeing rights (5,5)
26. Band; type of window frame (4)
27. Of troops spread out (10)
Down
1. A mound or hillock (4)
2. Can you bear Major or Minor (4)
3. Despite hole our sheds belong to us (12)
4. Race of men; tall, blonde and blue-eyed (6)
5. Collectively mechanical devices (8)
7. Yes, topic is plausible but deceptive (10)
8. Inflexible; unyielding (10)v
11. Trusting cheerfully by mere chance (5-2-5)
13. Dross is end product of being squalid and selfish (10)
14. Finds out for sure (10)
17. This makes Alice glum, being stuck with it (8)
20. Re land ploughed up, t reveals a grass weed (6)
22. A French soft cheese (4)
23. ...and a little bite of fruit pie (4)