Thanks for that advice c-bert. I'll certainly try to focus my eyes further down the runway. My instructor has told me several times to look at the far end, but by the time I'm crossing the threshold my eyes are fixed rigidly just beyond the prop, on the centre-line (oh, all right, whichever side of it I've ended up!). I think, having messed it up a couple of times, I'm just getting too tense on final. Sure next time will be better
