Instructions:Just found this code today when I went to my local boots.
500 extra advantage card points when you spend £55 at Boots.com, £55 must be spent in a single transaction. The code can be only use once per customer as defined by email address and/or credit card address and/or delivery address.
Only one promotional code can be used per transaction. Offer cannot be used in conjunction with certain other boots.com offers. Excludes prescription items, gift boxing, delivery charges, gift vouchers/cards and infant formula (up to 6 months).
Quidco offer 3.5% on Boots.com too