Productivity or, more accurately, the lack of it, has been the bane of Britain's economy since the 1960s. There was an interesting interview in The Times with Tony Blair today where he pointed out there just aren't enough people working enough in Britain today.
A lot of people are working less than would traditionally have been the case, whilst at the same time demanding better public services. Where will the tax revenues to pay for these services will come from? The old cry of 'tax the rich' sounds attractive, until you bear in mind that the top 1% of taxpayers already pay 29% of ALL Income Tax raised. The richest also have the option to move overseas, thus depriving the country of any tax revenues from them.
The other point to mention is the lack of efficiency and accountability in the public sector. Money, in the form of our taxes, gets wasted left, right and centre in vast quantities, without anyone batting an eyelid.
I've always believed that a country, just like a household, should spend what it earns and not borrow more. Some people believe that it's fine for the UK to borrow more and more money every year to fund public services. However, with the cost of just servicing that debt via interest payments now at £89bn in the 24/25 financial year, that seems crazy to me.