Number group		Front design		Designators		Earliest known date	
	
			--------------------------------------------------------------------------------------------
			81,000,001		Bus - Handy Hints	T-c1 to T-c4		December 2009
			    to 
			81,100,000

			81,100,001		Not seen as yet		(by 11/2010)
			    to									
			81,200,000

			81,200,001		Not seen as yet		(by 11/2010)
			    to									
			81,300,000

			81,300,001		Not seen as yet		(by 11/2010)
			    to
			81,400,000

			81,400,001		Bus - Handy Hints	T-a1 to T-a4		June 2010
			    to 
			81,500,000

			81,500,001		Not seen as yet		(by 11/2010)
			    to						
			81,600,000

			81,600,001		Bus - Handy Hints	T-a1 to T-a4		December 2009
			    to 
			81,700,000

			81,700,001		Bus - Handy Hints	T-a1 to T-a4		January 2010
			    to
			81,800,000

			81,800,001		Bus - Handy Hints	T-a1 to T-a4		January 2010
			    to 
			81,900,000
	
			81,900,001		Bus - Handy Hints	T-b1 to T-b4		January 2010
			    to
			82,000,000