Britons have spotted a whopping 150 UFOs this year, according to figures.

Reported 'alien' sightings are at their highest level for years - with authorities now hearing about four mysterious objects in Britain's skies every week.

So far this year 150 apparent 'flying saucers' have been reported to police, military bases and the Ministry of Defence, compared to just 135 for the whole of 2007, and 97 the year before.

The figures, released after a request under the Freedom of Information Act, suggest that 2008 will be a bumper year for alien activity.

"Something really bizarre is happening in the skies over the UK. I've been dealing in sightings for 30 years and we currently have something very real which mankind cannot explain," the Telegraph quoted Malcolm Robinson, founder of the research group Strange Phenomena Investigations, as saying.

A spokesman for the MoD said as long as sightings presented no threat to British airspace, they were not investigated further. The MoD remained 'open-minded' about aliens, he added.

Sightings included a saucer near Maenporth, Cornwall, strange lights in Cardiff and a disc hovering by a tornado in Rufford, Lancashire. (ANI)