Do you think of them as a single unit? If so, you can make an argument for the singular. If you think of them separately, then use the plural.
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BarbaraPAI believe that BrE would use the plural for a collective noun like "orchestra" anyway, with or without the conductor.We often do but, for some of us, it depends on the context. There is no absolute rule about this.
fivejedjon We often do but, for some of us, it depends on the context. There is no absolute rule about this.