London-based property investors deny selling licences to casinos claiming to be based on Anjouan, a tiny Indian Ocean island

The island of Anjouan, rising out of the Indian Ocean between Mozambique and Madagascar, is a corner of the Earth that few people have heard of, let alone laid eyes on.

Known as Nzwani in the local language, this tiny volcanic island – one of a collection that make up the Union of Comoros – counts ylang-ylang oil and vanilla among its chief exports.