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Miles to Latitude and Longitude, UK
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Here is a formula for calculating the distance between a set of coordinates:

C = sin(Latitude1/57.3) * sin(Latitude2/57.3) +
    cos(Latitude1/57.3) * cos(Latitude2/57.3) *
    cos(Longitude2/57.3 - Longitude1/57.3)

Distance = 3959 * acos(C)

where
3959 Earth radius in miles
57.3 Convertion from deg to rad. (Or 180/pi)

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