Everyone on new contracs at my store (an Extra) are on £6.47 per hour, regardless of age. CSD-ers are on £6.70 or so. There is a UK group-wide pay rise of 2.5% coming soon, bringing pay for customer assisstants up to £6.81. The £7 per hour rate one of the above-posters has mentioned is the "established" rate of pay, which you receive after one year. Also, the staff discount (10%) is great.
Now if you'll excuse me, I need to go to bed - I'm working a 6AM til 5PM tomorrow on dot com and the trolleys. Every little 'elps, and all that.