You really don't get the concept of taxation do you Noodles?
It pays for hospitals, pensions, the police, education, defence, healthcare, etc. etc. The money that governments take from people in taxation goes back to the population in services and benefite. David Cameron doesn't get the money personally. for some obscure reason you seem to think those who work for a regular salary should pay extra so that the wealthiest in society may enjoy all of those things free.
If I send you my electric bill will you kindly pay that for me? There's a good chap.