They say: “Just choose your favourite Sub and SubStack it with three hash browns for just 50p extra.”
The Super SubStack includes three hash browns and two pieces of streaky bacon for just £1 extra.
Secret receipt number
One Subway worker recently revealed that when you make a purchase in-store, your receipt will have a random voucher on the bottom of it, meaning you can get freebies when claimed three to five days after your visit.
According to the employee, you can get any premium sub for £3 which is valid for up to five days after your visit.