I recently got all five series shipped to me in Australia and they are still as funny as ever. Series 3 contained the best episodes i think. DC of Love, Flash and the peeing your pants funniest episode of all Between a Rock and a Hard Place.
Highly Recommended. If you havent seen The Detectives, its worth the chance to buy it. Unbelievably funny.
If you love British comedies like Red Dwarf, The Brittas Empire, Fawlty Towers and so on, you will love the Detectives.