UK police arrest 23 people after protesters block lanes on M25

Insulate Britain protesters sit on the motorway on the M25 in Surrey to campaign to improve home insulation. (Insulate Britain/PA)

Police in England have arrested 23 people after environmental protesters targeted London's M25 for a fifth time in just over a week.

Surrey Police said they were called to junctions 9 and 10 of the motorway just after 8am following reports of Insulate Britain protesters on the clockwise and anti-clockwise carriageways.