As Nik said, always great to get another Brit on here! We're still out-numbered, but maybe not for long! The word is spreading this side of the pond...
Where in the UK are you?
I think Nik covered the basics. You'll get used to a different diet...always feeling ill after eating certain foods is a good way to stop you wanting them! Everyone cheats now and again, the trick is to get stable enough and learn enough about your tolerances so you don't suffer THAT much from lapses.
Are you on any meds? I was predominately D for ages (now A) and I found taking 1 Immodium every morning (as prescribed by my GI) really helped me to stabilise.
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Welcome!
The word is spreading this side of the pond... 
