Where have you read the expression? I need the context – otherwise I’ll be tempted to be a smart***e and say that “the weather” is not relevant to planning. Actually, it could be now I think about it
Hi Robbie, I’m sorry to say that I cannot help you. It hurts me to suggest this but have you checked what the big boys have to say on the matter? Try BPP or Kaplan and see if they have anything on the subject of “matters not relevant to planning”