In March 2017 BBC Radio 4’s ‘File on 4’ transmitted a programme ‘Rogue Hauliers’ in which David was interviewed regarding his involvement in the investigation of the Grittenham Haulage ‘Bath Tipper Lorry’ accident .  The heavily laden lorry was unable to stop as it travelled down a steep hill in Bath and four people , including a 4 year old girl, were killed.  The brakes on the lorry were in very poor condition and some were incapable of working owing to very poor maintenance.  The owner and mechanic were sentenced to 7 1/2 years and 5 1/4 years imprisonment respectively.

The programme is available as a podcast.