PRV outlet

I have just visited a property where one discharge pipe from an unvented cylinder is tee'd in below the tundish. This is from the inlet/combination valve (prv). I know technically this should be situated above the tundish, but due to the citing of the valve it would have been impossible. I have advised the customer that it should be moved and they have declined. My question is then would it cause any harm to leave as is?