
Regarding the registration of litters from AI in the UK, I checked because years ago the UK wouldn't accept known AI 'mating'.
I found this -
https://www.thekennelclub.org.uk/breeding/breeding-from-your-dog/artificial-insemination-ai/I have a suspicion that this goes on amongst more breeders than we know about!!
Back in Canada, and going down to the States for the stud dog I wanted, he wasn't interested so having tried, we took both to their vet where his sperm was checked, and she was checked to make sure she was right on and an AI was done - sperm collection to insemination via the 'normal way'! No surgery. Before leaving for home, we tried again the next morning, without success. The result was two pups, one DOA. As the breeder welcomed us for a repeat, we went back the next time - another AI and this time 5 puppies.
Many popular stud dogs in the States never naturally mate with their bitches mainly, it's said, to prevent infection.
https://www.revivalanimal.com/pet-health/managing-males-hot-weather-breeding/learning-centerSome of this article may help.
If the sire of this dog is still alive, and available, you might be better to use him? It's said that the (proven!) sire of the nice dog may be the better option.
Just to add - has the dog had any surgery recently - years ago now I had planned to use a male here but when my bitch finally came into season and I phoned his owner, I was told he'd just had an inter-digital cyst taken off (in time to heal before Crufts). I changed my mind about using him and went elsewhere.