The London Assembly has called on the government to better protect the capital's playing fields.

In a letter to culture secretary Hugh Robertson, the Assembly cites its concerns over "potentially serious gaps in information and strategies" that are designed to monitor and protect playing fields.

Local authorities are responsible for protecting playing fields under threat. According to Sport England guidelines, each authority should have an up-to-date strategy setting out local need and site provision.

According to the Assembly, however, only a quarter of London boroughs have strategies less than three years old and a quarter don't have one or are not preparing one.

Murad Qureshi, chair of the Assembly's Health and Environment Committee (HEC) said: "It currently seems no body has the powers, remit or resources to monitor and protect London's playing fields effectively.

"It's only a few months since the 2012 Games came to a close and people inspired by them look for opportunities to take part in various sports.

"But if we are to secure a sporting legacy, the ongoing availability of playing fields is vital.

"Playing fields are not only essential for the health and well-being of Londoners, but provide important green spaces within the urban environment."