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Wedding fever hits Chatsworth as Fiona and Steve's big day approaches. Whilst the Gallagher family make preparations for the big day, Steve teams up with a gangster on a big drugs deal, convinced the job will set him and the family up for life. But when a vengeful Tony begins plotting against him, it sets in motion a chain of events that changes life for the Gallagher family forever. Meanwhile, Frank nearly discovers Ian's secret, so Ian asks Mandy Maguire to be his "fake girlfriend" in order to cover his sexuality, whilst Carol's dog causes trouble for Marty.