(I can't find where I got "decade" into my head). They didn't announce a policy change on the matter, but they have auctions for companies to bid for guaranteed electricity prices every couple of years, the most recent one this year. The government were warned that their guaranteed price is too low considering recent inflation and supply chain increases and no bids were expected for offshore wind power, they did nothing, no companies bid in the last auction, so there won't be any new offshore wind power built this round. The next auction date doesn't seem to be announced, there is an announcement that they might become annual so it could be next year. (Having companies' offshore skills idle the next year or two seems likely to lead to knock-on delays if future auctions are bid for and won).

From https://www.bbc.co.uk/news/business-66740920 - "Dan McGrail, the chief executive of industry group RenewableUK, told the BBC: "Industry has highlighted to government on several occasions that this auction has been set up in a way which is very unlikely to secure the capacity we need to stay on track to meet the government's own target of 50 gigawatts of offshore wind by 2050 [up from 13.66GW now]." and also "Labour's shadow energy secretary Ed Miliband told the BBC: "This is just the latest episode in the Tories' 13 years of failed energy policy. They broke the onshore wind market by banning it, they undermined the solar industry by removing the feed-in tariff, and they caused chaos in the home insulation market with their failed schemes."

https://www.bbc.co.uk/news/business-66749344 - "the lack of offshore wind will be a blow to the pledge to deliver 50 gigawatts (GW) of offshore wind by 2030 compared with 14GW today."

So you can either think that was incompetent or malicious. And when trying to decide you can look at the mentioned de-facto onshore wind power block the Tories put in since 2015 ( https://www.bbc.co.uk/news/uk-politics-66715141 ) and the previously announced ban combustion cars by 2030 which they pushed back to 2035 while talking about a new ban on solar panels on farmland ( https://www.bbc.co.uk/news/live/uk-66863110 ). Or maybe their Return to Office policy ( https://www.bbc.co.uk/news/uk-politics-61145692 and https://www.reuters.com/world/uk/get-back-work-office-britai... ) which.

And you can see https://www.gov.uk/government/news/pm-redirects-hs2-funding-... about the HS2 rail, and wonder to yourself why the "Spiralling HS2 costs" were something the government could not cope with, but the "faster journey times, increased capacity and more frequent, reliable services across rail, buses and roads" are something they will be able to deliver. When part of the HS2 plan was to move intercity trains off the local lines and freight off the roads, leading to more frequent reliable road and bus journeys. "billions to fix potholes on the country’s roads" - first, we know what causes potholes; heavy vehicles moving frieght". And this is more reliable bus journeys from the government which brought us "Buses in 'crisis' as 3,000 routes reduced or scrapped" in 2018 ( https://www.bbc.co.uk/news/uk-england-44681974 ) and killed off 20% of bus services in the last year ( https://www.bbc.co.uk/news/uk-politics-66442599 ).