Down to my last few but I'm stuck on these. All names of birds, but no indication of letters. 6. One has a cowl, another is round. 10. Filter about the point 14. A quiet image in an unusual guise. 20. Take a lttle time and be more careful Marian. 21. A piece of Attinghams river 23. Exchange greetings without the vocal arrangement. 27. Gem Gas 29. Old terminal judgement 30. Quiet Henry, take a rope.
23. I wonder if this is egret? exchange, i.e. anagram of greetings minus "sing" / vocal arrangement. Although a vocal arrangement would be song rather than sing