//Enquiries revealed that Churchyard had visited Jill’s home and surveyed the site. He had agreed with her and her family that the gate would be an electric metal sliding gate for the driveway, to maximize the car parking area at the front of the house. However, he did not leave an instruction book or operating manual for the gate with the family.
When the gate failed for the first time on 22 March 2013, it had to be opened manually and when Churchyard visited a few days later he told the family there was a problem with the optical electronic safety devices and he re-aligned them. The gates then failed again on the day of her death.
When questioned by officers following Jill’s death, Churchyard claimed that when he had first fitted the gates he had also fitted a stop/bracket to the rail to prevent the gate falling off it. He further claimed that the family had questioned the requirement for the stop and accused them of removing one he had fitted. Investigators could not find any evidence to support Churchyard’s claims of either the stop being part of the gate or that the family had ever discussed this with him. Churchyard’s failure to fit the stop meant he breached his duty of care to the family and this breach of duty caused Jill’s death.//
Source
http://www.heart.co.uk/eastanglia/news/local/man-jailed-womans-death-from-faulty-electric-gate/