There are a LOT more preservatives in UK food. My GI tract rebels horribly to most food here, and I have gastroparesis to begin with. Yogurt, real sauerkraut, Kefir, and/or a good probiotic and making sure you're getting enough healthy fats will help. I also don't get along with the tap water so I drink bottled spring water. I still have to take magnesium oxide gel caps but I have chronic issues and I'm also allergic to most other gentle laxatives. Magnesium citrate is also pretty gentle for keeping things moving, natural calm is the brand I use for that. Feel free to send a PM if you want, sadly GI stuff is just part of my genetic disorder so I have far too much experience with different treatment and dietary options and have no shame talking about it!