Hydrogen fuel cell cars do exist: the Toyota Mirai and Hyundai Nexo are the only two mass-production hydrogen cars you can buy in the UK today. While the theory behind hydrogen cars makes perfect sense, the realities are that creating a hydrogen refilling infrastructure is more complex than first thought and the cars are even more expensive than EVs. As things stand there is only 12 hydrogen filling stations around the UK. The technology is stuck in a 'chicken and egg' situation - but that may change in time as other car companies are looking again at hydrogen.