This is a way to break away from an air-to-air missile (heatseeker):

First you have to find out where the missile is coming from (KenV had the right idea), if the missile is behind you, pull back your throttle to almost idle possition, break hard left/right and go down about 45 degrees while dropping flares and/or chaffs. When you reach the 45 degree downward possition stop using your flares but still bend down until you are heading strait down.
Bank left\right again after a few seconds, put your throttel to full military power and pull up (towards the original direction you were coming from).

When you push your throttle forward again, make sure you don't use your afterburners! That will probably make the missile lock onto you again.
This has been said to work allot.

I'm not familliar with the "Martin Baker", can some one please explain?

-Warlock