The reason other posters are taking you to task is because the PE ratio of Canroys is not as important as other metrics, namely cash flow, pay out ratio, life of reserves, and others. Perhaps you could spend more time educating yourself.
My suggestion would be to listen to the conference calls of the top 5 or 6 trusts. Digest the highlights of the company reports to see what THEY find important, and finally view the past company presentations. After doing this due diligence you will know what is more important in this sector verses another more conventional one.