The secondary threhold is being increased by £21 per week - this is normally the important one as the LEL only really matters for when employees are entitled to Sick Pay etc.
Latest budget
http://www.hmrc.gov.uk/budget2010/bn01.pdf
7. For National Insurance, the secondary threshold will rise by £21 a week above the level that indexation would reach. The secondary threshold for 2011-12 will not be known until publication of the RPI for September. The secondary threshold change is in addition to the increase in the primary (employee) threshold already planned for 2011-12, and the 1 per cent rise in rates.
Also from Dec 09
http://www.hmrc.gov.uk/pbr2009/individuals.htm#d
•For the tax year 2011/12, in addition to the 0.5% increases to rates already announced at PBR 2008, the Chancellor has announced that there will be a further 0.5% increase to those rates, making a 1% increase in total from 6 April 2011. The primary threshold and lower profits limit will be increased by £570 to compensate the lowest earners - See PBRNote 01