"...it seems the RAF are a law unto themselves a freind of mine was missed by only 150 feet on final approach to Popham by an F15 at 250 feet altitude !! He was following a GPS track with his head down in the cockpit"
I don't think that is correct. The RAF have practiced their skills to the nth degree over many decades.
Your friend, whether on a GPS track or not, at 100' should not have his head in the cockpit (assuming that is what you meant!). At Popham, and that height, he should have his eyes on the stalks. Probably on short finals too! Sounds more than a little crass to me - and it depends on which runway he was approaching.
