Gwyn Williams was over taken by the ambulance shortly before the crash in the New Forest and told ITV Meridian what he saw.
He had been driving along the A336 between Brockenhurst and Lyndhurst in the New Forrest.
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The Orkney Islands took second place, followed by Rutland and Wychavon while last year's winner Winchester falls to fifth place.
With more people in the UK living in temporary accommodation, parts of England will soon trial a scheme which has tackled the problem.
Forecast for tonight and tomorrow in the west