now there is also a widescreen tickbox however which ever res I choose ticking the w/s box everything within the game is not in a correct ratio, i.e radar stretched.
The 2D interface elements almost always get stretched in games whether you use a 16:9 stretch option within the game or a true widescreen resolution. You just have to deal with it. As long as the 3D scene looks right, that's the best you can do. If you look at most of the games mentioned on these forums, both those that support widescreen out-of-the-box and those that require a hack, we've all just grown accustomed to things like health-indicators and radar screens being a little wide.
The reason for this is that you would need a custom overlay for the wide resolutions, which most developers don't bother doing. The interface is mapped to a regular 4:3 ratio no matter what. We're happy if we can get the 3D elements displaying right without any stretching due to FOV issues.
You just have to get used to the short, fat radar. :(