First of all welcome, a friend of Jez's is a friend of mine. There are several possibilities, firstly Tig can do something, secondly as Micca suggested a cork, thirdly smile and make a joke of it, fourthly get your own back i.e fart better than him, fifthly get him to move out or move out yourself, sixthly have a can of air spray ready or comstantly bombard the room with aromatherapy smells, seventhly stop feeding him cabbage and brussel sprouts.

Good luck

Gillie