Four definitives released on January 5.
Two 1st class values and two Worldwide to 20g values form the Olympics definitives which will be released on January 5.
One of the stamps at each value bears the Olympic logo, with the other bearing the Paralympics logo.
The images are being released with 300 days to go until the Olympics.
The stamps are printed by Walsall, which said around a million stamps an hour would be printed.
Behind-the-scenes video of Walsall, with an interview with Andrew Hammond, Royal Mail's head of stamps and philately: