When you add the second footlong, it will change to €0.00 before checkout. No code required. So two footlongs will work out about €6.80.
BOGOF Footlong Subs on Mobile Order & Pay
Offer ends 31st May 2020. Buy one Footlong Sub on Mobile Order & Pay via the Subcard® app or website and get a second Footlong Sub of equal or lesser price free. At participating stores. Extras additional. 1 free Footlong Sub per order. No additional discounts. No delivery. Only valid for Mobile Order & Pay orders.
Mobile ordering for collection in-store only. Prices and participation may vary. In-store discounts and offers may not be available through mobile ordering. 18+ only.