Can I appoint a financial advisor to manage, on a discretionary basis, my IBUKL Junior Stocks and Shares ISA?

Can I appoint a financial advisor to manage, on a discretionary basis, my IBUK Trust account?
Can I appoint a financial advisor to manage, on a discretionary basis, my IBUKL Stocks and Shares ISA?
Can I cancel my IBUKL Junior Stocks and Shares ISA?
Can I trade on margin under the IBUKL Junior Stocks and Shares ISA?