The approach angle is the size, or steepness of slope or obstacle, that can be can be approached or climbed without striking the bodywork. (the front bumper in this case)
The standard approach angle on a Discovery is good (40 degrees) but it can be made even better by removing the lower plastic trim on the front bumper, and then trimming away the lower part of the plastic quarter bumpers.
The job is straight forward. There is a line of bolts just under the front bumper which hold the trim in place. Removal is as simple as undoing these bolts!
Once removed, the size of the quarter bumpers will look a bit silly, so you can cut away the excess plastic at the base of the bumper using a jigsaw.
The mod will also allow you to install jate rings onto the bumper mounts, so you have good strong front recovery points. An alternative to this would be to fit a steering guard with integrated recovery and front jacking points. The benefit of this is you protect your steering arms, you get a strong recovery point, and be able to use a high lift jack on the front of the Discovery.
I will probably go down the steering guard route when fund's allow, but as I had the jate rings lying around from a previous Land Rover, i thought I would put them to good use here.
Here is the end result:
So there you have it, a simple mod that will help your Discovery's off road performance.