Bite the bullet and hire a Pom to proofread before publication. Most English/Aussie/Kiwi speakers can understand American English easily enough, so an English-English specialist should have no trouble. You could strike trouble with technical and chemical terms (Methylated Spirit is a denatured alchohol, but is it Denatured Alchohol?).

Have you heard the story about the Portugese who published an English-language guide to Portugal? Unfortunately, he didn't speak English, but he did have a Portugese-French dictionary and a French-English dictionary.....