The Sweeney "Thou Shall Not Kill!" ( episode 19)
Siege at a campus bank. The reason I stick this one up is because they are called in to this and it's not down to one of their many many grasses. Tbh they don't really do much 'detecting'
... regardless it's another humdinger wif a coupla tearaways taking some 'ostages when their escape falters. Some triffic SHOUTING in this one