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Her Majesty's Revenue and Customs, the official UK Government Tax Entity, HMRCHer Majesty's Revenue and Customs, now known as HMR
The USA's own Internal Revenue Service, IRS page for Citizens Abroad.
Information on Tax Credits and Child Benefit.
FAQ for individual expat tax topics, especially regarding the IRS amnesty program, OVDI.
In the UK, fortnight is commonly used as a period of time, which is two weeks.