Puzzle 258 is Glinka's The Lark in the Balakirev arrangement I believe, IGI.
Right nationality, right bird, but wrong composer and composition, sadly, Mr Garnett.
D'oh, that'll teach me to rely on the clues without going back to listen to the snatch again.
I think on further reflection it might well be Glinka's
The Lark transcribed by Balakirev.
Correct, Mr Daniel. Collect 180 points! Mr Garnett was just pipped at the post on this occasion, I'm afraid. Fear not, there are countless clues out there for 243!!
As the snatch was set on 03 March 2008, 23:12:48, we calculate a bonus of 295 points (3 days, 1 hour and 45 mins)
18254 + 295 = 18549 points...
all these additions - good job I'm the Maths Manager at school!