Instructions:Found on MSE thanks to crazyposhgal
Make sure you are logged in and if you add a No 7 item £5 or under such as:
Flawless Finish Sponges £3.50
Glasses Case £4.89
Cleansing Sponges £3.50
Muslin Cloths £4.40
Lipstick Case £3.50
Hair Band £3.92
Exfoliating Sponge £3.50
Top and Base Coat £4.89
and a pack of 16p Paracetamol or something else cheap ( 35p Paracetamol, 39p Paracetamol,49p/59p Shower Gels)then enter the Code at the bottom of your basket it will take the price of the No 7 item off leaving you 16p to pay. This will only work if you chose delivery to store at the checkout stage.
Obviously you could choses an item over £5 and pay a little bit extra such as:
http://www.boots.com/en/No7-For-Men-...200ml_1015683 = £1.50 with voucher
and it does not have to be paracetamol it can be anything on the site you add as long as it leaves you with something to pay.