Info taken from their facebook page...
'On the 29th October we will be celebrating the new Arndale Panchos Burritos by giving away one free taco and @jarritosgbr. T&C's Apply
*Offer is valid for one Taco plus one Jarrito per customer. Offer is subject till stock lasts. Only valid on the 29/10/16 and cannot be used in conjunction with any other offers
At the Arndale only.'