Women Dart Points

Another kitty cat joke!?
A man was driving down the street when a cat darted out in front of him and was hit. The man pulled to the side of the road and checked the collar for an address. Going to the front door, the man rang the bell. An elderly lady answered the door.
The man said ” I am so sorry maam, but it seems I have ran over your cat”. “If you would allow me I would like to replace it.”
The woman said ” Thats all well and good but how are you at chasing mice.”
Can you guess what movie this joke was from?? 10 points to the correct answer
Heres a hint: london
Easy, Mary Poppins!
“I once knew a man with a wooden leg, named Smith.”
“What was the name of his other leg?”