Almost two thirds of Scots believe the Scottish Government's Named Person policy represents "an unacceptable intrusion" into family life, according to a new poll.

The survey revealed just 24% of those questioned said they would trust a named person to always act in the best interests of a child - even where this conflicted with the wishes of the parents.

The poll was commissioned by the Christian Institute, part of the No to Named Persons (NO2NP) campaign group set up to challenge the Children and Young People (Scotland) Act 2014.

A total of 6120 adults, including 532 in Scotland, completed the online survey by ComRes between March 2 and 13.

The Act sets out measures to assign a single point of contact, usually a teacher or health official, to be held responsible for the welfare of every child up to the age of 18.

The Scottish Government says the service will act as a safety net to help families and children if they need it, but critics argue the move breaches the human rights of parents.

Asked if "it is right for every child to be assigned a named person to monitor their well-being", a total of 24% of respondents agreed, 58% disagreed and 18% were unsure.

It also showed 79% said they would be concerned if a family disagreed with the named person over what was in their child's best interests.

Colin Hart, director of the Christian Institute, said: "The named person scheme is the most audacious power grab in the history of parenting.

"Parents are, on the whole, best placed to care and look after their children and where they are not, the state and all of its agencies should focus on helping those people.

"It should not be targeting decent, hard-working people who are simply trying to raise their children according to their beliefs and values."

Campaigners against the proposals previously lodged a petition for a judicial review at the Court of Session in Edinburgh, Scotland's top civil court, challenging the lawfulness of the provisions.

It was, however, rejected and judges have since refused a later appeal against the decision.

An appeal has now been heard in front of a five-strong panel of justices at the Supreme Court in London over two days, with a decision to be delivered in due course.

Last week, during First Minister's Questions at Holyrood, Nicola Sturgeon said parents are not legally obliged to use the scheme, but it is right that the service is universal.

An SNP spokesman said: "This poll shows that more people in Scotland than in both England or Wales agree that their Government 'does a good job of balancing the need to protect children at risk, while not penalising parents'.

"The named person policy is about supporting, not diminishing, the role of parents - and has already been been upheld by the highest court in Scotland, including a ruling which said the policy had 'no effect whatsoever on the legal, moral or social relationships within the family'."