The British need not apply because the program is intended to increase the diversity of nationalities living within the USA. The UK has sent more than 50,000 citizens to the US over the last 5 years, along with Canada, China, Colombia, The Dom Rep, El Salvador, Haiti, india, Jamaica, Mexico, Pakistan, The Philippines, Russia, South Korea and Vietnam. Those people from Northern Ireland, however, are welcome to apply.
(Where is Sweden? I thought you said that Swedes could not apply?)