Instructions:Spotted this code on an ancient post and gave it a go ... worked a treat for 10% off! Just enter "Affiliates" in the voucher code box and 10% off your basket.
Delivery by Royal Mail is free.
I don't know what, if any, limits apply, but worked for me on a 26 pound spend.
Hope it helps someone else .....
UPDATE: Damn! I only checked Quidco, but have just spotted that TopCashBack do 10% too! I must practice my patience!! :(