Voters remain wedded to Britain's taxpayer-funded model of healthcare even as NHS leaders question its sustainability, according to a Guardian/ICM poll.

Analysis by NHS England and by outside experts points to a large funding gap that could reach £30bn by the end of the decade, and last month 71 health service leading lights wrote to the Guardian to warn politicians that failure to level with the public about the black hole before polling day would jeopardise the service's future.

Asked how they would tackle the future funding of medicine, voters are resolved by a margin of more than two to one that "raising taxes for everybody, to put more money in" is the right way to go.

Tax-funded increases in expenditure are preferred by 48% of respondents, while 21% who rather countenance charges, such as paying to see the doctor, and 19% think it would be better to cut back on the range of available treatments.