Monkeyboy,
Consider the interpolation (?) good practice for when you sit the Met practical. I'm assuming the JAR ATPL's are not disimilar to the National ones, as for that you had to interpolate a whole route's worth and work out the average wind speed and direction. IIRC, I had to do London to Jo'burg.
PS
Edited for useless spelling - why can't I spell?
[ 26 October 2001: Message edited by: Polar_stereographic ]