Preventing parallel proceedings by Obtaining Anti-Suit Injunctions. There is nothing inherently wrong with multiple actions. This is a developing area of the law.
Different judges reach different conclusions on the same facts.
This may arise because of differences between the different jurisdictions' procedures, which could affect the result. Ease of proof eg strict liability available in some US jurisdictions. Different quantum of damages Length or cost of legal process. Supreme Court Act 1981 section 37. Indirect interference in the activities of courts of another country, explained as based on our in personam jurisdiction.