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This is only a test setup so not too important but the menu's are not loading correctly.

http://www.windsurf.me.uk/test/cpg133/

It ia apparrent that the <li> is picking up the class from the overriding template. I am using dependant selectors to avoit all other css conflicts but what is the best way to fix the .li?

Sorry, this should have been in themes :-[. Moving accordingly

try taking out
.dropmenu li {
position: relative;
}

Not sure if that's the issue your having but the drop downs worked for me after that.

also add
.dropmenu li {
overflow: visible;
}

Good pointer.

Ended up with this code in style.css

.mainCell .dropmenu li {
    float: left;
    overflow: visible;
    padding: 0;
    margin: 0;
}