But, Josianne and Atqui, is assuming that the government is like a household, or a business enterprise and only has a certain, limited, amount of money to spend.
This is not true. The government, by way of the Bank of England, issues money. Governments have always issued money. That is the main way that the supply of money in the economy is increased. If there was a fixed amount of money available each member of the population, which increases year on year, would be getting a smaller and smaller share of the limited amount of money available. How would you account for the fact that in the 1950s, say, the population of the UK was about 51million and average wages were less than £10 pw while now the UK population is about 68 million and average wages are about £500 pw ?(https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/employmentandemployeetypes/bulletins/averageweeklyearningsingreatbritain/latest)
That money has had to come from somewhere and it certainly wasn't from taxation of the much smaller amount of money circulating 70 years ago. The truth is that, apart from some money which has come to the UK from export earnings (and balanced, don't forget by UK money going abroad to pay for imports) , the government has increased the supply of money available by issuing more.
The biggest factor in controlling the amount of money issued is inflation. Some inflation is tolerable, but if the government kept on issuing money when there weren't enough goods and resources available to buy with it then rampant inflation would occur, such as in the much quoted examples of pre WW2 Germany and Zimbabwe.
But it is painfully obvious that there is no shortage of goods and services available to purchase in the country at the moment. The NHS and social care is a prime example, likewise improving infrastructure. There should also be investment in the 'Green' economy to combat climate change. So there is no reason to limit the supply of money at the moment.
The primary tool used by governments to control the amount of money in circulation is taxation. Taxation takes money out of the economy to stop runaway inflation taking hold.
So, that's the simple explanation.
It gets more complex when one considers that there are two 'economies'. The 'real', everyday economy that we are all involved in of buying and, in many cases, providing (businesses) the goods and services the population wants or needs.
The other is the economy of the stock markets, hedge funds, etc. where people are speculating mainly to increase their wealth without actually contributing much to the 'real' economy. I think of it as the 'money market' where the concentration is on just increasing wealth. It's not an intrinsically Bad thing; I'm sure that many Gnetters have savings invested to 'grow' their money, in stocks & shares, ISAs, National savings vehicles etc. but it is non productive and does little for the 'real' economy unless some of the 'wealth' is spent.
But what I am trying to say is that there is no earthly reason why the government should, at this time, be trying to restrict the supply of money to the real economy by cutting back on government investment. There is plenty for it to 'buy' that would provide jobs and services to support businesses and the 'real' economy. The pandemic money wasn't 'borrowed' and doesn't have to be 'repaid'. It was newly created money.
Sorry this is so long, but it's not really a very simple thing to explain.