Missing black and white cat Mitch, last seen in Bursledon

Name of the cat is Mitch, breed British Long hair. He is neutered and chipped. He is predominantly black with white belly and white under chin, white front paws and white hind legs. His DISTINGUISHING feature is streak of white from his mouth/nose up to mid of his forehead. He was being looked after by a friend in bursledon Southampton when we were on holidays and he escaped on 20 July. He is completely unaware of the area. We are really keen to find him, it’s been 7 weeks now, each day is becoming harder and we are trying to keep the hope. He is really missed. We have put a reward of £100 and really want him back. Any help is much appreciated