"Spanner in the werks", there is no need to PM. I believe in being open and honest, the reg of the aircraft was G-AWPU. Please take me up on my offer to meet, I shall be very civil with you, as I am to anyone that I meet. Don't take my word for it, feel free to speak to the Management or my colleagues about my conduct. I take my work very seriously and therefore slagging me off on a public forum, seems very petty and immature. Why don't you meet with my student, CFI and myself to obtain further facts. You have my word that I will not discuss this issue with my student before we meet. He will be able to tell you that I drummed it into him about maintaining at least 500ft above ground level. I chose Hawarden as a place to obtain a trace, because I considered to be the furthest airfield from my position. If I was as low as you stated then I am sure the trace would have dropped out. Can you please confirm whether or not you spotted the aircraft north of Standish?