tbh, we use semi skimmed milk, but only becuase its handy, no sugar in milk, but full fat is less processed i guess, also more filling. yes, greek yoghurt is the way to go, you can get big tubs of it in lidl.
crikey, well the 'banned list' was quite extensive, but basically, no white potatoes (though nicola variety ok boiled in the their skins ok - got very excited to find nicola potatoes in lidl last week!), no wheat, but spelt ok (less processed easier to digest), no sugar, no veg oil.
so veg, meat, fish, yoghurt, honey, maple syrup, brown rice, spelt pasta, beans (not heinz!) and pulses, there is so much you can eat (just doesnt seeem like it in the first couple of weeks, lol), cook everything from scratch, you can have puddings, just gotta make em, butter, cheese and dairy allowed, even made yummy ice cream. (85% dark chocolate is your friend ;-) in small doses)
the key is to stick with it (im sure you burn more colories cos your always bloody cooking the next meal,lol).
the thing is, once you cut out the sugar in everything and only have natural sugars, after a few days, you can taste if something has sugar in it, cos it tastes unnaturally sweet, its bizzare, ive always had (and still have a very sweet tooth, so make cakes and biscuits and stuff, but ds cant taste the sweetness in them, not that i like to share them ;-))
i did it a couple of years ago, we had a whole thread going, called isobel los rios diet or something, i have kinda adapted it this year. dp has done it to and lost 2 and 1/2 stone and still drinks lots of beer (not fair emoticon).