Not close to, they're already at that point. That's why so many are refusing promotions/overtime if it takes their wage over a tax cliff edge like £60k or £100k, or they pay into pension to get their gross wage under the cliff edge. It's why so many professionals are leaving the UK and getting jobs elsewhere.
Literally all the graduates at my son's employer are planning to emigrate once they've qualified as actuaries and accountants - most of the leaving "do's" aren't for retirements, they're for 20 somethings who are emigrating.
People need to wake up and smell the coffee. We can't keep clobbering the middle and higher wage earners to subsidise those who either don't work or only want to work part time hours, just enough to get their UC entitlements.
We're at a pivotal point where workers are being hammered enough, especially considering workplace pensions, NIC, student loan repayments, not just income tax.
There is no alternative but to get more people working IN the country to reduce our imports, increase tax/nic revenue, reduce the benefits costs, etc. We also have to reduce the costs of public services and public spending so that the current (I think) £38k threshold where workers actually contribute rather than being net takers, is reduced to a more realistic level. We can't keep increasing tax revenue to pay for public spending - we need to reduce public spending too - a good start would be reducing the waste and inefficiency.
It was a pipe dream to think we could survive and prosper on a service economy relying on cheap imports for everything from goods, to power, to call centre staff - trouble is the politicians havn't worked it out yet and still cling to the flawed idea that we can survive on the financial services industry, hospitality and tourism and somehow prosper on the backs of very low paid staff in the Far East! Trouble is those staff in the Far East are now wanting more for themselves too and their wages etc are increasing, added into the profits expected by the factory owners, ship owners, etc., that's driving up prices back to the kind of level they'd be if we made the stuff ourselves in the UK!