Transferring money from forex trading

Question about forex trading if anyone can help please. 
I understand from what I have read that forex trading comes under gambling and is therefore tax free.
My primary source of income is my main job and I get paid around £2000 per month.
If I was to start successfully making for example £5-10k per month on forex and was withdrawing that amount into my personal account would it flag anything up and would I need to explain where it was coming from and what I was doing to either the bank or HMRC? 

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