52. Where in consequence of the proposed construction of any of the authorised works, LUL or the undertaker requires the removal of apparatus under paragraph 46(1) or the undertaker makes requirements for the protection or alteration of apparatus under paragraph 48(2), LUL must use its best endeavours to co-ordinate the execution of the works in the interests of safety and the efficient and economic execution of the authorised works and the undertaker must use all reasonable endeavours to co-operate with LUL for that purpose.