Does anyone have tips on how to improve upper range. Most notes above the G at the top of the staff are 'inconsistant'!!

One of the most important things to remember is to always keep the air moving. This is especially true as you ascend! Faster air == higher notes. One good way to work on your air is to play scales up and down focusing on crescendoing as your ascending and decrescendoing as you descend and doing this as fast as you can. This will do two things 1) the air will naturally be speeding up as you ascend and cresondo and 2) by doing this fast, you learn to always have the air turned on.

Another thing to look at is what is happening with your lips. As obvious as it sounds, the lips must remain in contact in order to vibrate. Do a scale and when you start having problems, stop, don't lower you horn or change your embouchure and examine the position of your lips. Use your tongue to feel where the lips are in relation to your teeth. For example, is my lower lip pushed up against my upper teeth -- if so then the lips can't vibrate.

Lastly, relax. Probably the hardest thing to learn (as I am still learning this). Its too easy to tense up and stop the air. In fact, you might think you are pushing the air as hard as you can when in fact all you are doing is tensing your abdominal muscles. Again, pay attention to your body as you ascend.

I agree with bradnroberta that air flow is key here.

Don't forget the diaphragm - as you explore the upper register this becomes even more important. One tip that I've always found useful to remember is that the lungs are huge - they stretch all the way up to under your arms. With this in mind, your seating position is important: give your diaphragm space to expand by sitting upright, with your arms gently lifted.

With the right stance, the lips in position, a steady airflow and a nice, relaxed approach, the top notes will begin to really sing - or at least they will once you've got some stamina going!

Good luck - and nothing really beats sustained practice in the upper register to improve range & tone!

Work through the partials starting on F sharp, play up legatto and stop before it becomes a squeeze you should manage 5 or 6 partials at first, doing the same exercise for G, Ab, A and so on up to C. when 5/6 overtones becomes easy try for 7 then 8 ect....this is a very useful execise for developing the 'Screamer' range.