Is coupling based on a British show?

The question contains a slight misconception. The original "Coupling" is itself a British show, created by Steven Moffat and aired on the BBC. It is not based on another British show; rather, it is an original creation. However, there was an American version of "Coupling" produced by NBC in 2003, which was based on the British original. So, the American show is based on a British show, but the British show is not based on anything else. It was inspired by Moffat's own observations of relationships and his desire to write a comedy that honestly depicted the complexities of modern dating and sexual dynamics. The show stands on its own as a seminal work of British sitcom writing, influencing later series with its innovative storytelling techniques. Therefore, "Coupling" is the source material, not the adaptation, in the context of trans-Atlantic television exchanges.