Pretty self explanatory. Info below copied from site.
Never had the need to use a cash for gold service so cant comment personally on it, but may be of use to some.
Get a great price for your unwanted gold with Tesco.
At the start of the year a little extra cash goes a long way.
Get £10* per gram for your broken, damaged and unwanted gold along with 1 Clubcard point for every £1 exchanged. This free service is secure and convenient with a brand you can trust. Get a pack today as this exclusive offer is only available in January 2011. See what the press say about the service.
4 easy steps to exchange your gold...
Fill in your details
Bag up your Gold
Post your Gold
Receive your money
Price per gram of 9 carat gold
Tesco - (exclusive January offer) £10.00*
H&T Pawnbrokers £6.50
(Recommended partner of WHSmith) £3.37**
Check the value of your unwanted gold today
Rates based on the price per gram of 9 carat gold quoted on the websites of H.Samuel (hsamuelbuying.co.uk) and H&T Pawnbrokers (harveyandthompson.com) on 30/12/2010. * Offer is valid for consumer transactions only before January 31st 2011 (excludes business or commercial exchanges). ** Postgoldforcash.com (recommended partner of WHSmith) has no price calculator on their website so the price quoted is based on the payment received from selling 12.75 grams of 9 carat gold on 30/12/2010. The comparison was made on postal services.