Five models tested had some risks attached said Which? although the majority of models tested actually failed the British Standard on one or more aspect.

Many of the problems were comparatively minor, said the testers; not enough information in the instructions or, in one case, an edge that was a fraction too sharp.

Five of the stair gates though, had more serious safety problems and Which? recommends people avoid them altogether.

The Jonelle Wood & Metal Gate, Bettacare Auto Close and Safety 1st Portable Safety Travel Barrier all showed, to some degree, risks of snagging; for example, a piece of child's clothing, a bib or a dummy. In the worst case scenario, this could lead to strangulation - a slim possibility, but not a risk many parents would knowingly be prepared to take.

The Jonelle Metal Extending Gate and the Mothercare Wall Fix Extending Gate could also be dangerous. Each has a fixing that can be removed, releasing a spring small enough to be a choking hazard for small children.

Although Which? has alerted manufacturers to these risks, they dispute the findings and there are no plans to take these gates off the market.

Which? editor Malcolm Coles said: "Most of the gates we tested were safe, and are an effective and relatively inexpensive way to make a home much safer for children."

"We're concerned about the ones which pose a danger to children still being on the market, though, and would advise people choose one of our Best Buy models instead."