The Government Says

M5 j22-21 - overnight resurafcing works

A four-mile section of the M5 northbound between junctions 22 and 21 is to be resurfaced to improve safety for road users.

http://nds.coi.gov.uk//content/../ClientMicrosite/Content/Detail.aspx?ClientId=36&NewsAreaId=2&ReleaseID=415166&SubjectId=36

seen at 05:49, 28 August in National College For School Leadership News - national.