It's obvious why the Tories are thinking about allowing onshore wind again: a huge chunk of the mainstream media, including the BBC, have been pushing the idea that it's the superior option which the Tories are just ignoring because they're conspiring with fossil fuel companies to screw us. At this point it's probably not politically viable not to allow it even though it makes little sense. The BBC's been doing things like describing them as the "cheap, reliable" option every time they talk about the Torie sblocking onshore wind and omitting the fact that they're basically worse on both counts than the offshore wind the UK is building these days, repeating any claims the leader of the opposition makes on the topic verbatim and unchallenged, and even outright describing one of its big fundamental disadvantages as nonsense.
> The Tories said no to onshore wind
That's actually changed as of this week https://www.bbc.co.uk/news/uk-politics-63880999
At the same time they are thinking about allowing wind on land again (probably because it will no longer be the cheaper option).
Given their links to fossil fuel interests it comes across as delaying tactics.