Tut, tut. C'mon chaps use your imaginations ! The location of checking isn't the point. The point is the wording on the documentation and the stamp of engineering acceptance that perhaps accompanies it.
Most countries, that have an approximate educational equivalence in or out of the EU , accept each others standards and specifications - CE is widely accepted as is still, BSS.
Whether the examinations are held in Munich, Timbuctoo or Balham High Rd. makes absolutely no difference.
The transference of independence back from the EU to GB can be a path as smooth or, as rocky as some of the participants wish to make it. At the moment there seems to e a significant number of influential people on the EU side who wish to make matters as difficult as possible, with the intention of, perhaps, trying to punish GB for its temerity in both leaving and exposing the fault lines within the EU
To all the doomsters I would remind them that GB provides a huge export market for the EU. They need our goodwill. Don't bite the hand that feeds you.