Hi,
I used to work in your area. Although I don't have any contacts specifically, you could approach Andrew Melling's practice in Bolton as they do farm work and they may be able to help. There are a few dairy farms between Heywood and Middleton, in fact there's one that makes ice cream on Doctor Fold Lane, Heywood (they have a livery yard there too). Worth just turning up and asking. They are the sort of people who know everyone.
Hope you get sorted x