The inquest into Amy Winehouse's death may be declared invalid after it was revealed the coroner in charge did not have the correct qualifications for the role.

The inquest recorded in late 2011 that the singer had died as a result of 'misadventure' and was chaired by Inner North London Coroner Dr Andrew Scott Reid. In the process of dealing with the case, however, Reid appointed his wife Suzanne Greenaway to the role of Assistant Deputy Coroner. According to reports in The Sun today (February 1), Greenaway confirmed that she had resigned in November after it was discovered that she did not match the requirements which govern the appointment of coroners. According to the rules, Greenaway should have been a solicitor in the Law Society for at least five years, but she had only been part of the organisation for two-and-a-half.

She should also have served five years as a "qualified medical practitioner", but the Australian only qualified as a nurse in her native country.

It could mean that all 30 of the inquests she worked on, including Winehouse's, could be declared illegal - but officials insist this will only happen if the verdicts she recorded are challenged in the High Court, reports The Sun.

Greenaway's husband, Dr Andrew Scott Reid told the publication, "In November it became apparent I'd made an error in the appointment process. While I am confident that all of the inquests handled were done so correctly, I apologise if this matter causes distress."