UPVC Door doesn't have drain holes

Hi all, I've had a look around the forum as our upvc door frame is collecting water in the threshold bottom part. I'm familiar with the drainage that it is supposed to have but......and here's the weird thing I can't get my head around........on the outside of the frame there are factory cut drain holes (the long oval shaped ones with little caps over), but on the inside of the frame there is nothing! I've cleaned the frame out of any dirt / grit etc. but can't find any drain holes for the life in me. Obviously this is not normal and I'm thinking maybe an error at the factory?? I just wandered how easy it is to make the holes myself from the inside? Would it be just a case of carefully drilling a couple of holes inside, located just above the outside slots?

 

Easy just drill about 5 6mm holes one end and 5 the other

 

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