CDF trading in 212

I’m a novice in this trading platform and would like to know the meaning of the blocked fund and the implication of this fund in case I decide to close the account… I have learnt that I can withdraw from the FREE FUNDS but what do I really owe in this account? For instance if my CFD account has account Value of 1000(free fund=300+700 blocked fund)pounds. In practical terms what do I
owe and at what point can I have access to the blocked funds?

Blocked funds is a partial of your funds parked aside when you have an open position. If you have no open positions, blocked funds are 0.