Newsflash : I found the tiniest snippet of the tune in the Miss Marple Mystery "Murder at the Gallop." At minute 32-35 there is a scene where Miss Marple reveals that she is the owner of the fabulous 1895 saddle and takes Hector Enderby's arm as he escorts her out of the room. At that point they play a very quick and distorted phrase of the tune. Then Flora Robson playing Miss Milchrest comes in with her canary in a cage. She's seeking employment, and as she sits there tensely they play a slow and moody version of the snippet. It is such a tiny bit that I'm amazed I recognized it! But the fact that it was in this particular movie makes me think the tune is a hunting tune. This is also suggested by the music box my mother had: it was decorated with a fox-hunting scene. I hope someone knows this tune so well they can recognize it from this very limited source. Also, if you can suggest other hunting-based ballads, please let me know a few titles to check out.
                                                       Thank you,
                                                       Bousingo