Instructions:PCBS42 worked for me today (29/12/2010) - no baby items in basket either.
Spend £20 at Boots and get £5 off.
Vouchers from Boots Parenting Club Mailing
PCBS23 valid from 15/11/10 - 29/11/10
PCBS43 valid from 30/11/10 - 14/12/10
PCBS24 valid from 15/12/10 - 29/12/10
PCBS44 valid from 30/12/10 - 13/01/11
Also - PCBS22 valid from 20/09/10 - 30/11/10 was sent this one a while ago, just found it in my wallet..... you may need to include a baby item to get this last code to work.
Ignore the expiry dates as they seem to work after the date has passed, just ensure that you are a member of the Boots parenting club and have logged in. Some of the codes can be used more than once and others not - just try them all.