My hybrid has no front bumper either and has a bull bar instead, it passed the SVA test and passed the past 3 MOT's since too.
It may be a question of sticky out bits rather than the bull bar it's self, i do know when i cut down the bumper on the LWT i spoke to the then local plod shop and they told me i had to paint it yellow and 'smooth' any sharp edges.
Hope this is of use, no doubt someone will be along to correct me but still, telling it how it is for me personally.