http://www.johnlewis.com/idealhome

This page will give you a code which you can use at the online checkout for £10 off your order as long as it is £50 or more:-

T&C's from the page:-

Terms & Conditions of this Promotional Offer
Your entry to this promotion is subject to these terms and conditions.£50 minimum purchase required.This offer cannot be used in conjunction with any other promotional offer or discount.Offer valid until midnight on 31 December 2007,This offer is not available on purchases from the John Lewis Gift List and cannot be used to purchase gift vouchers.This offer is not redeemable in John Lewis department stores, Waitrose supermarkets, Waitrose Deliver or Ocado.£10 Coupon valid for credit/debit card purchases only (no bankers draft or personal cheques can be accepted with voucher).John Lewis normal returns procedures apply.All other John Lewis terms and conditions apply.Returns Procedure for goods purchased using a Promotional Offer

The normal johnlewis.com Returns Procedure applies to goods purchased by credit or debit card and using a Promotional Offer.
Refunds relating to goods purchased using a Promotional Offer (if applicable) will be credited to the purchaser's credit or debit card at the purchase price less the value of any Promotional Offer amount and applicable charges (as set out in johnlewis.com's return policy).
If more than one item is purchased using a Promotional Offer and if after return of one or more of these items, the total value of the order comes to less than £50.00, then the total value of the Promotional Offer ( -£10.00) will be added back to the total price and a refund will be calculated accordingly. For example, if two items are ordered, one at £48.00 and one at £55, and if the item costing £55 is returned, it therefore reduces the total value of the order to £48.00. In this case, the refund of £55 on the returned item is then reduced by the value of the Promotional Offer. Normal return policy rules will apply on items returned within 28 days of the date of despatch.

Check for discount codes to use at www.johnlewis.com