The question , " Does the U.K have a plan " is the wrong question , for you anyway .
The question should be , " Because the U.K and it's governments past and present have no plan , what is your plan " ?
If you're here , i can assume you already have a plan to survive and thrive .
It's the idiots that think that the government , and the country are somehow going to help them that think this question applies to them .

For those with some time - this is also interesting

https://www.youtube.com/watch?v=wEQQEAaBMXw

The question is a bit meaningless.

Growth of what? If it is GDP then why do we care? It doesn't mean anything to real, ordinary people. It includes all sorts of rubbish that no normal person would consider to be productivity. Like paying benefits. GDP can rise whilst the average person gets poorer and experiences a lower quality of life than before.

As Andrew pointed out, they are using immigration to make this silly metric look better, and then it is easier for the government to borrow money, which they will use in a way that undermines real growth. None of this has anything to do with making the country, by which I mean the people who live here in particular, better off. In fact, the per capita wealth is declining.

So how can there be a plan for growth when the way in which governments think about growth is a total joke that is divorced from reality?

One way to get economic growth is to have plentiful and cheap energy - obviously. Our governments intervene to deliver the exact opposite.

Selling things to other countries to earn hard currency helps. But this requires cheap energy, lower taxes and competitive labour market with preferably skilled workers. Our governments make energy expensive, increase taxes, and hoover up vast quantities of labour into the public sector and what they import from abroad mostly seems to be low skill and needs to be subsidised.

The current house building plans... nobody seems to have asked who will build them all. We don't seem to have an abundance of experienced builders and tradesmen. And building materials are already expensive. So that will be an inflationary exercise, the houses will be expensive to build and probably poor quality. Plugging the skills gap with foreigners... guess what they will need to live in? And the proposed numbers of units won't even cover 4 years' worth of immigration. They also seem to think that the planning system will be streamlined but their proposals don't reduce the regulatory burdens other than to make it a bit easier to build in the green belt. The planning system will still be overburdened and slow. They've promised hundreds of more planning officers but they don't exist and new ones take years to train. And 300 only results in half a planner per council. So the house building dream seems half baked and misguided, plus, how does that help us earn money in the world?

No, there's no growth plan. They don't know what growth, or productivity, even is and they are doing the opposite of what's needed in most cases.