Myself and my wife started doing the bs diet about a month ago, this week my wife had to go abroad on business leaving me to my own devices. I had some tasty meals chicken salad, pork chop with roasted veg, however I allowed myself to eat more fat than I would if my wife was here. Crackling and chicken skin, cmon who wouldn’t! However, every time I did this’ I had a very very poorly tummy. Can anyone advise is this normal?

Sure it is normal, your body is not used to that much fat, did you used to eat that before BSD. It is now telling you not to eat it as it doesn’t agree with you any more. Try to stick to the good fats like olive oil or rapeseed and butter and full fat dairy.