It's a guess, but the lorry underneath appears to be an AEC Mammoth
Major MkIII. Dinky just call it 'Horse-Box'
This is a 1961 rehash of the British Rail Horsebox from ten years before,
in this finish it was made from 1961 to 1964.
This dinky was loaned for the photos to be taken from a private
collection in November 2011