We need public spending cuts with tax cuts, so it is fiscally neutral, this way more money will be spent in the private sector. When money is spend in the private sector the velocity is much bigger, so the money gets quickly recirculated reinforcing growth, plus companies will then start to invest some of the £750bn cash they are sitting on waiting to be spent once the economy starts growing and confidence returns.
This way tax revenues go up with the growth, which will reduce the deficit.
All taxes rises do is for every 1% rise, you will typically lose 0.9% to 2.8% tax elsewhere, this is the problem with austerity in Europe, which is why they are chasing their tails in an economic death spiral in Greece, Spain and Portugal.
The Government have also done themselves no favours where they have continually blamed the financial sectors for our woes, when in really, our crisis is a Government overspending (by Labour) which is turning into a sovereign debt crisis. What they have spent rescuing the banks is 2 to 3 years money they collect in taxes from the city. If it wasn't for services in this country, which run a balance of payments surplus of 2 to 3% of GDP, then our balance of payment would look really ugly, where it is lack of manufacturing, that gives us our import / export deficit. So when people talk about get rid of the financial sector as it is a liability, and scaling back the service sector to be replaced by manufacturing, be careful what you wish for.
Remember services covers a very wide range of industries including: Banking, Insurance, Accountancy, Legal services, Engineering consultancy (including ARM whose designs power 95% or phones and tablet computers), Architecture, Sport (Especially Premiership football as the most watched in the world, but also cricket, rugby, darts, snooker, F1 to name but a few), TV programs, Books (like Harry Potter), films, music and computer software (10% of games are developed in the UK) to name but a few.