Here are some suggested themes from the Blood Brothers extract that you could use as a stimulus for your work:
class – rich v poor
peer pressure
bullying
21st century masculinity
opposites attract
nature v nurture
social inequality/lack of mobility
fate
To get you started the beginnings of a brainstormTo share and note down ideas in a group at the beginning of the creative process or in order to troubleshoot a problem. or simple mind map response to Blood Brothers might look like this.