A company named 'Bridge Pictures' did the films that we have over here.
Since we only received FUNimation's dub for the Frieza, Garlic Jr. and a part of the Trunks saga (and, for a period, the Fusion saga when CNX was around), the movies from the US will contain a dub that UK television viewers may not by completely familiar with. That is to say, the dub won't contain the voices that UK viewers were familiar with for the majority of the television show.
If your brother has played any of the video games, though, he'll recognise the voices.
Edit: Ocean dubbed the first three movies, too, however. FUNimation has releases of them, as well.