to want to go on LighterLife as a kickstart to my diet

[ArribaArribaAndaleAndale]

I want to lose 2 stone; I know replacements meals with shakes is not the way to go but I need the incentive that a rapid weight loss would provide. Say I stay on the program for 4 weeks and lose 1 stone, then I could continue on my own and lose another one by eating healthily and doing some exercise. Or am I just fooling myself?

2 stone is not that much in the scheme of things. If you really put your mind to it you could lose that weight by new year by going low carb or similar. Lighter life is rarely the answer, the weight will go on as soon as you start to eat normally.

Think about losing it at the same rate you put it on. Any diet which does not help you to understand the ways in which you can change your eating habits is doomed to failure.
Sorry.
YANBU for wanting to though!