I said I'd post the tune; here it is. Sam sang the first verse a little differently that time, so note that the words are slightly different from the text above.

X:1
T:Cock-a-Doodle-Doo
S:Sam Larner, Winterton, Norfolk.
Z:Tish Stubbs & Sam Richards, 1977.
B:The English Folksinger. Collins, 1979.
L:1/8
Q:1/4=100
M:6/8
K:D
A|A2 F A 2F|c c2 c2 B|A2 A GFE|D3-D2
w:When walk-ing out the oth-er day a-long Vic-to-ri-a Park_
E|EEE EEE|c2 c c2 B|A2 A A2 A|A3-A2
w:A-long with a ve-ry old friend of mine we went out for a lark_
F|A2 A A2 A|c c2 c2 B|A2 A G2 E|D3-D2
w:We saw a man there sel-ling fowls, he had a love-ly stock_
E|E2 E E2 E|E2 E c2 B|A2 A G2 E||
w:I hand-ed him a half-a-crown and he gave me a...
|:D2 A A2 A|A3 z3|D2 B B2 B|B3 z3|
w:Cock-a-doo-dle-doo, Cock-a-doo-dle-doo
ccc ccc|c2 c c2 B|A2 A G2 E|D6:|]
w:Hick-et-ty pick-et-ty you know what, it's quite e-nough for you.