As far as I knew, as long as you can see the front ones when looking at the car from the side then thats fine.
EDIT - Having just had a look around on the internet, some people say that as long as there isn't a side repeater there then you'll be ok, it's just when you have one that doesn't work. Whereas other people say that you definately need them. The majority seem to think that it's all down to the individual MOT tester though, maybe a six pack of lagers will do the trick?
Hope this helps