I know what you are saying, but, with Labour, I fear a never-ending recession as the one that has gripped France. While the growth in UK has been weak, I won't lie, it is beating many comparable European countries, especially France.
I also agree the government should borrow some to invest. For instance, a £30-50 bn small business stimulus package, but that is not what Labour plans. Instead, they propose less cuts to Education and more investment in NHS, which, while good, is not really "investment" that will provide any growth. Plus, many modern studies show that, past a certain point, education spending has no correlation with quality of education.
Why do you fear this? The Labour government did a good job after the financial crisis of pulling us out of recession, had Osborne followed Labour plans we would have recovered much faster like Europe & America did. I would strongly recommend you read this persons critique of Osborne & the comments below as he answers most of the questions you may have in detail. You could also read a bit of this guys blog (Econ prof at Oxford) about the failings of austerity & the damaging impact its had on our economy although the first link is better for a concise explanation.