Number group Earliest known date Front design Designator ------------------------------------------------------------------------------------ 56,000,001 November 2007 Bus - Handy Hints T-b1 to T-b4 to and T-c1 to T-c4 56,100,000 56,100,001 October 2007 Bus - Handy Hints T-c1 to T-c4 to 56,200,000 56,200,001 November 2007 Bus - Handy Hints T-c1 to T-c4 to 56,300,000 56,300,001 September 2007 Bus - Handy Hints T-c1 to T-c4 to 56,400,000 56,400,001 September 2007 Bus - Handy Hints T-d1 to T-d4 to 56,500,000 56,500,001 October 2007 Bus - Handy Hints T-d1 to T-d4 to 56,600,000 56,600,001 January 2008 Bus - Handy Hints T-d1 to T-d4 to and T-c1 to T-c4 56,700,000 56,700,001 December 2007 Bus - Handy Hints T-c1 to T-c4 to 56,800,000 56,800,001 Not seen as yet to 56,900,000 56,900,001 Not seen as yet to 57,000,000