Then parents of a lawyer killed after window frames fell on her have spoken of their grief after a trail highlighted a string of health and safety failings.

Amanda Telfer was crushed when three window frames weighing more than half a ton fell on her as she walked past a construction site in Mayfair, Westminster on August 30, 2012.

On Thursday (March 23) a court found one man guilty of manslaughter, while another defendant and a company were convicted of health and safety breaches .

Police have since said the 43-year-old’s death was “completely avoidable”.

Speaking following he verdicts, parents Barry and Ann Telfer said their daughter was living life to the full.

In an impact statement for the court parents Barry and Ann Telfer said: “Every parent who has lost a child to a violent and sudden death knows the overwhelming shock and disbelief which is impossible to describe.

“We saw our daughter on the morning of the day she died.

"An hour before she was killed she was with us, telling us about her social plans with friends for that evening and for the weekend, looking forward to some interesting legal work that she was going to be starting that afternoon, planning a weekend in France to see her brother and his family.

“She was very cheerful, making plans and looking forward.

“An hour later she was dead, killed whilst walking along the public pavement in central London. We’ll never see her again or hug her again.

“We’ll never hear her laugh again or enjoy her company again. Amanda was the best company, funny and interesting herself and always interested in and fully engaged with whoever she was talking to.

"Loving, generous, supportive'

“She was very loving, generous and supportive to us and to all her family and friends.

"We spoke together regularly and she would contribute enthusiastically to every family event, birthdays, anniversaries, full of ideas and energy, however busy she was.

“We looked forward to her companionship and interest in us. Our lives were enriched by her and our old age will be diminished by her absence.

“She had so many plans for the future, ever improving her professional skills and for travelling. She was so full of life.

“It’s still almost impossible for us to believe that she really has gone or to come to terms with the random carelessness of how she was killed.”

Kelvin Adsett, 64 and from New Road, Slough, was convicted at the Old Bailey of manslaughter by gross negligence and offences contrary to Section 7a of the Health and Safety at Work Act.

Damian Lakin-Hall, 50, from Portsmouth Road in Cobham, was convicted of offences contrary to Section 7a of the Health and Safety at Work Act but acquitted of manslaughter.

The company IS Europe Ltd of Slough, Berkshire, was convicted of offences under Section 2 and 3 of the Health and Safety at Work Act.

The window frames - one around 3.2m square and two approximately 3.3m x 1.8m - had been delivered the previous day to the construction site in Hanover Square as scheduled but could not be fitted immediately due to other delays on site.

They were left on the pavement overnight, leaning against the building. No efforts were made to secure them and no barrier placed around them, and no checks were made on them when the individual defendants arrived on site the next morning.

As the victim walked past, it is believed a door in the building blew open in the wind, hitting the frames and causing them to topple and crush Ms Telfer.

Several members of the public came to help but she was unconscious and not breathing. Emergency crews pronounced her dead at 11.57am.

'We don't want retribution'

Ms Telfer’s parents continued: “We don’t want retribution for our loss of Amanda, though we will never recover from it.

“We want accountability established, responsibility acknowledged. Her death was avoidable.

“She was killed by two half-ton window frames which had been left standing at the side of a busy public pavement unsecured, unbalanced and unattended with no safety barriers round them.

“The risk to passers-by is obvious. Yet the risk was ignored and our daughter, a bright, beautiful woman with so much to live for, so much she wanted to do with her life, was killed.”

Following the verdict they added: “If construction companies and the people who work for them are not held to account for such high levels of negligence and incompetence then none of us is safe walking the streets next to construction sites.

“The Health and Safety training being given is totally inadequate, if risk of death to passers-by is ignored.”

Claire Gordon, 36, from Ashby Crescent, Leeds, and Steve Rogers, 62, of Sheering Mill Lane, Sawbridgeworth, Hertfordshire were acquitted of all charges.

Westgreen Construction Ltd of Richmond in Surrey and Drawn Metal Ltd of Leeds, West Yorkshire, were also cleared of charges.

The convicted parties will be sentenced on May 5.

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