thanks MJ - good advice as always.
India Four Two - on your second point - in my naivety i would think that was pretty dangerous to continue as you might have put yourself in iminent danger? or were you aware that a glider behind would have been critical and needed to land anyway?
I know when my abort line is and what my ASI should be, so until i have much more extensive experience(although even then) if the ASI is not working I would probably abort - surely this is the safest thing to do at all times?
regards
Tris