They have 2 chocolate deals running atm that you can use at same time, 43% of total spend.
Add a fairtrade bunch to basket - either one over £30 or a £29.99 bunch + card £2.99 to get value above £30:https://www.arenaflowers.com/flowers/fairtrade
Add these chocolates as well: https://www.arenaflowers.com/gifts/lindt-mini-pralines-100g
Then put in code freechocolate when paying, only works if you spend over £30 before adding the chocolates.
This should get you the add on chocolates for free - (£7.99) and the chocolates that they have added to the flowers (£4.99).
Total £12.97 saved about 40% off.