I apologise in full for this thread. I was well aware that it was the sort of thread which is often asked, however it was something of a clarification.
I could not find what I was looking for through the search function. Be that a deficiency in myself or in the search function, I will leave up to debate!
In truth, I am not a pilot, nor do I want to be one, I was asking on someone else's behalf, so I'm also sorry that perhaps my idea of what 'the best search terms' might have been was probably way out.
Thank you for the very useful list, it did point me in a useful direction.
Feel free to lock this thread now. It has served its purpose, and nobody need me berated by anyone else on my account.
Phil