This is why if you send an engine to the USA you have to serious due diligence on the company.
It is easy enough to find ones to stay clear of.
It is harder to compile a list "to stay clear of" in the UK because there are far fewer people who one can ask for references, but one quickly finds that some 50% of firms one would not use - on the basis of user feedback alone.
I used
Barrett Precision. However, I strongly recommend arranging one's own shipping, to and from their front door. This is true for most American firms - they don't really want to deal with foreigners.