Britain's privacy watchdog is set to take another look at what personal information Google is gathering from private wi-fi networks.

A sample had been investigated earlier this year by the Information Commissioner's Office after it was known that Google had collected personal details for its Street View project. Back then it was said that no "significant" personal data was collection. Google later admitted that email addresses and passwords were copied.

Privacy watchdogs in a number of countries, including Canada, Czech Republic, France and Germany have also investigated the information.

The gathering of personal data came into the spotlight after a request by data authorities in Hamburg, Germany, asking for more information about the operation of Google's Street View technology.

This report revealed Google had been "accidentally" grabbing data from unsecured hotspots for years as their Street View cars captured images of street scenes.

It is thought that Google have grabbed approximately 600 gigabytes of data.