Oh dear. I resorted to senna (boots own-brand but same thing!) last night on day 4 after starting LT with no 'movement'?! No motion yet (sorry if tmi!) but I hope it'll be soon!
I tried some of that fibre-clear but took 1 spoonful for 2 days with only bad stomach cramps to show for it. Fibrogel instead of being a laxative actually provides you with additional fibre so this may help.