Travelex Group is a foreign exchange company founded by Lloyd Dorfman and headquartered in London. Its main businesses are international payments, bureaux de change and issuing prepaid credit cards for use by travellers. It is the world's largest foreign exchange bureau and is a major donor and sponsor of the Royal National Theatre. In 2007 it proposed a 'space currency' called the Quasi Universal Intergalactic Denomination, as part of a viral marketing campaign.