Platform 7 was a former East Lancs platform. AIUI while the platforms were operated under different management although it was a single station. Not sure what that meant in practice mind!Was Preston not two stations at one time? North Union and East Lancs?
Not sure if any of the EL bit survives within the current station.
I don't think so.
There was a separate station, Manchester Mayfield, just across the Fairfax Street from Platforms 13-14 whose passenger services were moved to Manchester London Road (renamed as Manchester Piccadilly) in 1960.
The Network Rail site said otherwise
After railway nationalisation in 1948, Manchester London Road was operated by the London Midland Region of British Railways (LMR) and the London Eastern Region of British Railways (LER). They continued to operate Manchester London Road as two separate stations.
Would it be fair to say both Preston and Manchester Piccadilly neé London Road were both one station operated by multiple companies?