Cant see if this applies to all items, seems to read that within 30 days you can return anything
WHSmith store refunds
Bought something in store and need to return it? Send it in the post or bring it into any WHSmith store - within 30 days of receipt. Refunds are made onto your card, not in cash.
http://www.whsmith.co.uk/support/Hel...icy.aspx#store