How much salary per month is enough to live in the UK?

It depends how you want to live. Are you here solely to survive or are you looking for a life of luxury with your own private yacht (though there are much better places to live in with your own private yacht)? Do you want to live on your own, or in a shared house with other people? Do you need to support others and are you entitled to benefits? Some people do low-income jobs but still live with their family so most domestic bills would be taken care of. But some people live on the streets for which you don’t need a salary for; though I imagine that they would certainly like one. And of course, it depends on the area you choose and the facilities that you require too. A car (whether luxury or not), TV, phone and your preferred method of sustaining yourself all adds to the cost.