Thanks for all your replies all, good advice .
I figured this would be the case, I emailed INZ and they said roughly the same thing.
Hopefully it shouldn't cause any issues, but we can supply doctors letters if needed.
Now I just need to get the EOI form to work online - it's not letting me submit work experience evidence without crashing, grrr. I'm fearing it may mean I have to input everything again, ah well, another 4 hours I won't get back.
I just know it will all be worth it though when we get there.