@ktnez99 Why not simply buy another radiator & hose from BMW or Eurocarparts tomorrow, then take them to your man to fit before he goes on hols? It’s a quick & easy job.
Takes the guesswork out of it.
Then, whenever the parts you’ve ordered arrive - sell them on here. In fact I would buy them- the rad on my red Zed is probably 28 yrs old, so overdue for replacement
If your man also has time to MOT it, then great. If not, then as long as it’s driveable you can book it into any MOT garage and are allowed to drive it there in order for the test to be carried out. (Obvs need insurance)
Then at least you’d get some summer Zedding