It is the grand final. Months of masterclasses, mentoring and last-minute rehearsals culminate in a musical playoff between the two remaining orchestras at the Royal Albert Hall. At stake is the chance to perform at the celebrated Proms in the Park and be crowned Britain's most inspirational amateur orchestra. In preparation for the final, both orchestras are packed off to a boot camp where a team of professional musicians have been lined up to put them through the musical wringer. Series judge Paul Daniel gives them their last masterclass, while series mentor Chi-chi Nwanoku keeps a close eye on proceedings. With just two weeks till the playoff, the orchestras return to their home towns. We follow them as they struggle to squeeze in extra practices between work and families, fine-tuning their performance and adding final flourishes, preparing to do musical battle at the Royal Albert Hall. The series concludes with a once-in-a-lifetime performance from the winning orchestra at Proms in the Park in front of family, friends and an audience of thousands.