Besides a 4 % loss limit there are no clear rules to find and not even whether your 300/700 GBP are immediately lost if you violate this 4% SL rule.
Did you find any adress of that prop? I didn't.
I just found this about the founder ...
a not working personal website, a youtube and an instagram channel without exciting numbers of visitors.
Scam or just a nice business idea with a 4% loss limit (which nearly all successful FTMO traders failed)?
Guess who can only win by this concept.