Construction services group ISG has won a £32m deal to fit out the UK headquarters of Sir Philip Green's fashion group Arcadia.The project at Colegrave House in London's West End will see ISG fit out four storeys of the building to create revamped offices for the owner of Dorothy Perkins, Evans and Topshop.It comes hot on the heels of another major fit-out deal won earlier this month by ISG with Scottish Widows Investment Partnership.ISG Chief Executive David Lawther said: "We continue to be encouraged by noticeable improvements in the volume, scale and quality of London commercial office fit out projects reaching the market."Shares in ISG were up 1.05% at 241p. TB