R-R.
I would suggest that the thing that should be considered re-Teesside would be that Air Ambulance operations will often be at a high flight priority. This would/could mean that aircraft have to be held or broken off approaches due to an Air Ambulance launch. Of course, this would depend on the exact location of the proposed Air Ambulance site which I’m not familiar with. Costock is used by ‘normal’ helicopter ops which would have minimal effect, even if the site there were on a short final/very close to the upwind of the departing runway.
Oops! I see AP has covered this. I really must type quicker!