Hi Niahm,
I can't recommend you any specific probiotic because I'm not in the UK... but make sure you have the ones that contain one of the best bacteria for restoring the gut flora such as L. rhamnosus GG, S. boulardii, B. lactis and S. thermophilus. You should be able to read these names on the bottle or package insert.
Tempest, I didn't know that! I could never drink peppermint tea, it gives me nausea. I also can't use any toothpaste with peppermint, nausea... Actually there is only one brand I can use that contains sodium bicarbonate, but no peppermint and no sweetener (all the others have one or both).
Ju Ju, kefir is great!