
It's quite true that most judges will allow a degree of 'puppy-ness' with a puppy. However, whether it would affect his placing, or not, would depend on how good he is, compared to the others, and how bad he is about standing to be gone over. If the judge, especially at a show like Crufts, can't assess him properly - and with a coated breed especially you have to feel - then she may simply move on. But don't panic. If he's only 7 months and you have managed to qualify him for Crufts already, he must have quality!!
Is he a breed that has to be on a table to be examined because it might be a good idea, provided he doesn't panic up off the floor, to get him used to stand on a table, and get somebody else to gently go over him.