Possible Clues:

• 'Here A is from behind (2,3,4)'
• Where you'd expect The Yard to be following everyone?
• Trailing
• Back there
• Not in the van, unless it's the guard's van
• Where's there's here a behind
• Not in the van, except for the guard's one
• Not in the van, unless it's the guard's one
• Here a bit that's not in front
• Here, A is not in the van