1 protein should not be used as meal replacements, its always best to get real food in your system.
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I back iron science price is generally a couple of quid cheaper than myprotein and they sometimes throw in freebies with free next day delivery £55 for 5kg of whey isolate 90% (27g per scoop) and a 5kg bag will last you months !
2 if you are going to, ^^^this is the worst stuff you could possibly use...there is almost no fat, almost no carbs and its 90% isolate which is the worst thing you can do in this situation.
Don't over think your protein, if this is going to be meal replacement (or anywhere near that) you can go to town with your fats and carbs (to a point) I've seen your body type and I know your naturally lean so just find something that tastes good, use CONCENTRATE not ISOLATE, isolates are very very fast absorbing which is great right after a workout but as a snack/meal it's going to leave you hungry in a very very short amount of time. Concentrates are much slower and will keep you full longer.
Recap - Anything that fits in your fat, carb and protein needs, your trying to put on so don't be afraid of the fats and carbs too much and get a concentrate not an isolate.
also, is there a reason you specified whey? Casein is also very good and in many cases whey/casein blends can be the best and for what your doing I would look at good old muscle milk/monster milk. it's a blend of several different proteins, tastes like fucking ice cream and has some good lean lipid fats, carbs and a good amount of protein.