Instructions:Enter the code xxjjc4 for £5 off a spend of £50 or more on groceries (valid between 03/03/08 - 23/03/08).
I know this code isn't valid untill the 3rd of March, but I have just been able to bank it, so hopefully like the £7 off a £50 spend, it may work for others too.
TIP - for anyone who is unsure of how to bank the codes: Add £50+ worth of groceries to your basket. When booking your delivery slot scroll through the dates and pick one between 03/03 - 23/03. Enter the above code and click apply. Before making your payment and fully checking out, empty your basket and logout. The code (if it works for you!) is then banked and ready to use for the valid dates.