The US system is quite different to the UK though; they pretty much write off the last year of a term as it’s nothing more than a lengthy campaign trail. You don’t do that in the UK, government pretty much operates as normal until the election is called then it switches to the campaign trail. All things considered I prefer the U.K. approach to not waste a year.this is an overused excuse. it supposes the plans are poor and easily pulled apart. if they've done the numbers properly they stand up. if the policy is popular some of the media might even support them, they are in the businss of selling what people want.
interesting contrast the US presidential primary campaign. they come out with their policies over a year before the actual election, and arguing over them through the primaries is seen as battle testing them for the election proper. if Starmer plans to say reform NHS he's better to run it past the electorate early and gauge the response. if its not standing up now, its going to go down badly in the election too. truth is most the time politicans avoid saying too much policy in advance out of fear the other party will nick the idea or upsetting some of their existing support base.