The synthesis of networks from liquid crystalline polyesters bearing allyl groups as lateral substituents is reported. Crosslinking is performed both by thermally activated radical reaction and by UV irradiation of film samples containing the suitable activator. Moreover, fibrous samples have been crosslinked in the solid state by UV irradiation, "quenching" the nematic organisation on a macroscopic scale and resulting in a macro-oriented network. Crosslinking does not hamper molecular mobility. As a consequence, the degree of orientation and the length of crosslinked fibres change continuously and reversibly upon heating and cooling through the isotropisation transition.