The ban on onshore wind refers to the 2015 Written Ministerial Statement that amended the National Policy Planning Framework (NPPF) by introducing two new requirements for onshore wind developments in England: 

The demands of these two requirements have created a de facto ban on new onshore wind developments in England with the total installed capacity given planning permission from 2015-2021 being just 2.6% of that between 2009-2014.

The resolution source will be official communication by the UK government or a consensus of media reporting that policy change amounts to a lift of the ban.