What plane did my OH just see?

[MitchT]

OH called a few minutes ago. She works just off the M62 near Morley, near Leeds. She tells me she just saw a black, old fashioned plane with four props and was quite low but wasn't very noisy. That's about as good as her description gets! I know the Canadian Lancaster is black underneath but I'm not sure where it is right now.

[MitchT]

Thanks folks - I'll show her the pics when she gets home. I'm thinking anything could look black when silhouetted against a bright but cloudy sky. Hercules could be a good call. I'm only thinking Lancaster as I know there a couple doing the rounds at the moment, but I don't know what movements they had scheduled for today.