My Lords, service personnel will receive the increase from 1 May onwards. I understand that it is the general policy of all Governments not to backdate, to avoid adding complexity and risk to normal administrative operations. The noble and gallant Lord asked if the uplift in X-factor will be paid to mobilised reservists. X-factor is paid at the full level-currently 14%-to all ranks up to and including lieutenant-colonel or equivalent in the Regular Forces, full-time reserve service personnel on full commitment and mobilised reservists.