The Children's Society is using the results of a MORI poll it commissioned to put pressure on the Government to change the law on donor-assisted conception.
With the Government considering changes to the Human Fertilisation and Embryology Act 1990, the charity decided a poll would be an effective way of contributing to the consultation stage.
The survey, which is the first to show the public's attitude towards anonymity for sperm and egg donors, shows 80 per cent of people believe donor-assisted children should have a right to know the identity of biological parents.
Around 1,500 people are born through donor-assisted conception each year and are the only people who are legally denied the right to access information about their origins.
Children's Society spokesman Tim Linehan said: "We knew there was a consultation process and thought a MORI poll would be a good way to galvanise action. It's a fairly straightforward way of communicating the public's sense of unease at what is happening."