Change of use of two dwellings (C3) and office (use class E) into one dwelling (C3) including demolition of conservatory and porch, erection of single storey front/side and two storey side extensions, installation of a raised roof and construction of two dormer extensions to the front and one dormer extension to the rear, installation of rooflight windows, conversion of detached building to create two storey ancillary accommodation, erection of detached garage, alterations to land levels, installation of sewage treatment plant and ground source heating system, creation of associated access and parking area