I need to read the list more closely - but clover? I went to Agricultural College, did all the grass mix stuff in lessons, clover is a good one, just not too much in the overall grass mix.
...but I'll double check... it never hurts to double check...

Ok, had a quick mooch - could be opening a can of worms here, but, research appears to say that grass sickness (EGS) has been linked to
too much White Clover. Other views are that White Clover is fattening. Some opinion says White Clover is the worst - others say Red clover.
I think without getting too much into the scientific nutritional values here (which will conflict with each other anyway), I'd say just try to be sensible when feeding and/or choosing a grass mix for a new paddock.