Mothercare have recently introduced a price match promise policy throughout their stores and website.
Mothercare will refund the difference in price of an item ordered online (and delivered to store for free if you wish), PLUS if the item is over £20 in value, they will also send you a £10 gift card.
The standard price match is available in store too, but the voucher is not available if the whole transaction is completed in store.
This promise comes into it's own though when applied online due to the £10 gift card.
The only caveat is that you cannot price match with "Online Auction Websites".
Very good deal - You don't find many retailers price matching any website. (I know John Lewis have started price matching Online Stores, but only Brick and Mortar equivalents, eg. currys.com [if you haven't boycotted them already])
Note: The £10 is given if the item's value is over £20, NOT if the difference in price between them is £20.