rendering a wall: Lime or admixture?


I've recently completed a block retaining wall in my garden that I now want to render. In the past, I have gone the traditional route and used 50/50 sand, cement and lime. However, last week whilst in Toolstation, I purchases a 5 ltr container of Evermix 3 in :
http://tinyurl.com/mujko6
Does anyone have any experience to know if this is an adequate substitute for lime?
TIA
Mark
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