Due to the fact it will expand to a full time service in mid Wales, the Wales Air Ambulance emergency service will end up costing an extra £300,000 a year. It will operate for a trial period of six months with the intention of making it permanent. The charity, which made the announcement at the Royal Welsh Show in Powys, explained that seven-day cover was vital in such a remote region. Each mission is said to cost around £1,500.