Apologies if this doesn't apply to you, but the e-mail seems to suggest that this is a generic mail to all Quidco users (thanks emlin). Spend a minimum of £6 (£5+ VAT) through Quidco this month and get £10 on top of any cashback you earn. http://www.quidco.com/incentives/bonus-10
NOTE: It appears some users are ineligible, but there is no indication as to why. Possibly a duration of membership. Look out for a Quidco email as it could be an e-mail invite offer only.
"January doesn't have to be grey! Make a purchase through Quidco this month and we'll treat you to a £10 bonus on top of any cashback you earn.
From updating your wardrobe to sprucing up your home, snapping up gifts to booking a summer holiday…we work with over 4,200 retailers to make every purchase that bit more rewarding.
Simply shop through Quidco before 31 January 2015 and make an online purchase with any Quidco retailer* to claim your tenner. It might not stop the rain, but it will put a smile on your face. Promise."