I think Stew has a point, wanting to add £1k to your current salary is going to be a tough ask, not impossible and people do achieve it, but it requires more planning and execution of a strategy than luck. When I was 24, with A Levels, a good degree and three years work experience in various office type jobs I was on £22k (although that was fifteen years back). I guess you are going to have to aim well outside the norm of jobs to get that sort of money, or, retrain.
My brother is a car mechanic, dresses in knackared overalls all day and looks a pauper but has his own business and probably earns around £200-£300 a day after tax depending on what he works on - he started specialising in commercial vans and lorries, its a constant flow of work. He has no A Levels or Degree, just retrained with an eye on the future