Parents who provide 16 and 17-year-olds with alcohol to take on holiday may be inadvertently putting them at risk, campaigners have warned.
A survey for alcohol awareness charity Drinkaware found that almost two-fifths (39%) would give alcohol to youngsters going on a week long holiday if requested.
Of those, more than half (53%) would give five or more bottles of spirits or wine.
More than a third (36%) would prefer their child to get alcohol from them rather than an unknown source.
More than one in five (22%) said they buy their teenager alcohol to keep track of the amount they will drink.
Parents are happy to give alcohol to their children, despite two-fifths (41%) knowing that their child has had a bad drinking experience.
One in five is aware their child has been involved in an accident (20%) or had unprotected sex (21%) when drinking and 79% know their child has been sick.
Chris Sorek, chief executive of Drinkaware, said: "Lots of 16 and 17-year-olds will want to mark the end of exams by celebrating with friends on a trip away, but if parents provide them with alcohol, it could inadvertently put them at risk.
"Parents might think they're doing the right thing by ensuring alcohol comes from them instead of somewhere else, but when young people drink to excess it can compromise their personal safety and increase the chances of them having unprotected sex or being involved in an accident."
He added: "To help their children stay safe, parents should avoid giving them alcohol for unsupervised holidays and talk to them about possible risks."