Go onto http://www.supersavvyme.co.uk/triedandtested/solution-feminine-hygiene/pads-for-superior-protection.aspx and on the right hand side it says coupons. Click on that and its 'Always - any liners and pads'. Underneath it will say 'Tesco UK - £1.00 off.
Until 28/8/2012 Always Simply Fits Normal 18'S have been price droped to £1.00 so with the coupon you'll get them free :)
the website allows you to print 2 vouchers both with unique codes, thanks to coffeychild :)