Essential Oil - Tea Tree

The Tea Tree oil was bought as a present for relative so awaiting feedback on the oil and its use. However I spent a long time researching essentail oils available in California ( I live in England) and was impressed with Heliotrope's ethics and purity of products. The company kept me informed at each stage of the order and was prompt in despatch.
It is interesting to see photographs of the trees and plants relevant to each essential oil. It would also be interesting to know how the oil is extracted.