HMPO's contract with De La Rue involved the design of a new generation of biometric passport, which was released in October 2015 as the Series B passport. The cover design remained the same as Series A, with minor changes to the cover material. The number of pages of a standard passport was increased from 32 to 34, and the 50-page 'jumbo' passport replaced the previous 48-page business passport. New security features included rich three-dimensional UV imagery, cross-page printing and a single-sheet bio-data page joined with the back cover. At the time of its introduction, no other passport offered visa free access to more countries than the UK's Series B British passport.