I liked the look of this month's free plant offer (36 lavenders, £4.90 P&P), so went over to T&M's website and added them to my basket. The printed order form in the magazine reminds you to use the subscribers' discount code from a later page, so I've tried putting that into the T&M website, but although it then takes 10% off, it also causes it to add a further £4.95 P&P! (Which is a -100% "discount"...)
This is rather frustrating: the discount code page specifically says 'online only', but it can't actually be used online with the offer.
What am I doing wrong?!