Hi Robbie, I use Natural Instinct (working variety) it is very simple to use, you just need to defrost the tub and weigh out the portion required.
As you know, Charlie is only tiny, about 10kg and he has 200 - 250 grams a day. I give more/less depending on how active he has been.
I buy whichever is on offer, he has the same things most days, he does have the occasional bone as a treat, he has never said no!
I did but those blocks you get from PAH first though, to check he liked raw, as I didn't want to spend alot of money and find he didn't eat it.
Hope that helps.