green pumpkin

[poppie1]

hi all,where we threw the old pumpkins for the pigs last year,a plant has grown and a pumpkin has grown,nothing spectacular probably the same size as a henry hoover.but it is still a very courgette green?
is it because its a late developer,should i leave it,or cut it.
have never grown pumpkins before,(mind you i cant take any credit for this one either)