if you have a tesco club card register it online. you then go to rewards and the gardeningplant section, choose how many vouchers you want to exchange( £5 tesco gets £15 of Thompson and Morgan). Checkout using the tesco voucher number. They then send you an email with your link to t&m website and their voucher code choose your goods and on checkout use t&M codes. Well worth it I had £30 yesterday and had £30 last October. Not bad as i work for morrisons and hardly every use tescos but i changed my alacrity and gas to eon and you get club points for every £2 you spend.