Custom protein builds... Which %

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Hi id like to try this companies custom protein builds...http://www.myprotein.co.uk/

Which percentage would be best in getting the right mix..

heres an example:
15% Egg Albumin Powder
75% Whey Protein Concentrate 80
10% Calcium Caseinate
-Flavouring: Straw. Extra
-Sweetener: None
-Container: Sealed Bag

for £39 sterling..