I am learning the flute and have difficulty getting the higher notes.
Is there a tried and tested method of hitting these notes for a beginner, without sounding screechingly loud? I realise that by altering the embouchure and increasing airflow i should hit them but seem to be failing? Maybe i need lots more practise and patience?
As a beginner, you can't expect to be able to play the full range of the instrument. I don't know how long you've been playing, or exactly what you consider to be "high," but work up to those notes slowly, and have some patience. Take a note that you're comfortable with and do some chromatic longtones slurring upwards from it. If the tone starts to suffer, don't push past that pitch just for the sake of playing higher. Continue to work upwards maintaining a decent sound. As for altering embouchure and increasing airflow, only tiny changes should be necessary (most likely angling the air upwards slightly and forming a smaller aperture will be what you need to work on), and you shouldn't need to blow MORE air, but increase the speed and pressure of the air (which making your aperture smaller should help). It will take some time to build up the abdominal muscles so you can support the high range, as well as the muscles involved in controlling your embouchure.