Ask other parents who teaches their child; but remember all children are different
Local music shops or libraries are good sources of information and advice
The Incorporated Society of Musicians has a register of teachers with a recognised professional qualification, a reference and teaching experience
Check how long they have been teaching
Ask to have a one-off taster or consultation lesson to see how your child gets on
Is singing or movement part of the lesson? This can help with younger children. How much fun do the pupils have?
Do they belong to a recognised body?
Be sensibly alert to child protection issues