My family and I ( husband, mum,dad and my 3 month old) came to eat in at Brighton Las Iguanas around 9 pm for dinner. It is not our first visit and we've been to many other Las Iguanas before. We are asked about allergy and confirmed my husband only was allergic to red food colouring,E122. We were already sat at our table when the manager came to tell us he cannot let us have dinner because of the allergy as he couldn't check for the red food colouring. We've told him that it was fine as we will order what we usually have here but we were rudely refused. We even said that we will eat only and my husband would not but we were categorically refused. It stared to feel as it he wanted us out of the restaurant and us being the only brown people there and him shouting at us to leave was absolutely unacceptable and humiliating when we only wanted to eat. I understand the policies but I'd like to believe there is a level of politeness and customer service to deal with this situation in a better way. It was late at night and I had a baby in my arms with mum ans dad being old. He could have let us at least have a drink or choose things off the menu that made sense there would be no red food colouring like a salad, chips/ fries. It was only my husband who had the allergy and not the rest of us. But no we were asked to leave immediately as if we've committed a crime. This is absolutely revolting to be treated this way and I hope other customers do not experience the rude manners of this manager. We wanted to eat but we were refused. That's a first we've experienced.