Portfolio Minimum Investments. The minimum investment for a collective portfolio is £10,000, for a hybrid portfolio is £50,000 and for a bespoke portfolio is £100,000. Should Clients make withdrawals that reduce the value of the portfolio to 10% below the minimum investment, we reserve the right to request either a transfer to a different service or to withdraw the portfolio. Once fully completed, this form should be sent to: Rowan Dartington Intermediaries Xxxxxxx Tower Xxxxxxx Street Bristol BS1 4RD