Ok have some info on this as we have finished paying ours off and have managed to get over £400 off from the original balance, just say you purchased a cot and put it on your babyplan and then a week later you see it reduced you can request that reduction off your babyplan, we did that with ours, plus pram plus bedding etc. You get the discounts that are in store but you have to do the legwork and inform them to adjust your balance.
xx