Sorry if there is a thread like this that already exists, but seeing as i've taken advantage of three recent £10 vouchers, i thought i'd start a list.
It's simple... find a product cheaper than on the mothercare website and mothercare will price match it. If the price of the product is over £20 on the competitiors website mothercare wiil also send you a free £10 voucher. This is for a limited time only.
Once you've found a product, ring 0844 875 5133 to make your order. Tell the sales person the mothercare product number and the competitors website it's cheaper on. Also confirm you'll be getting a £10 voucher to be on the safe side.
Some people have managed to get a voucher even if the product is under £20 due to various mothercare sales staff not understanding their own t&c's.
At the time of posting this, these deals below seem to qualify but i'm not sure what mothercare class as a competitor.