is this path really a ford along all its length?

I think this footway needs area=yes, and possibly also should be highway=pedestrian

if car park is level 1, then the parking aisles and service roads need to be level 1 also.

public highway from here eastward. poor quality tarmac

restricted byway East from here. no motor vehicles October to April inclusive

byway track North from here.

restricted byway starts here. closed to motor vehicles October to April inclusive. surface compacted stone until bridge over old railway, then grass and earth.

byway southeast from here, compacted stone, good condition, wide

public highway northwards; byway southwards, poor quality tarmac with grass in centre, narrow (8ft)