Hi
You do not state how you acquired the money from forex prop firms.
I you acquired and disposed of shares, there may be a gain after you have deductd your qualifying expenses.
This woudl be reported in the capital gains section of the tax return (SA108 -
Self Assessment: Capital gains summary (SA108)).
If this was earned income arising from self employment, then this would be declared in the self employment section (SA103 -
Self Assessment: self-employment (short) (SA103S)),
along with the qualifying expenses.
Thank you