Is it yours ? - if you have a private generator or private substation, and the wiring is entirely under your control, it may be practical.
If not, and you do not know the route and type of cable from the substation to the property, you need to consult the network owner. The whole point of TT, is that it is what you do when there is no earth supplied, and for some good reason the neutral may not be used, either for reasons of voltage offset, or the security of the cable, and how great is risk of loss of neutral while live remains connected, such as with overhead single cables.
Is it yours ? - if you have a private generator or private substation, and the wiring is entirely under your control, it may be practical.
If not, and you do not know the route and type of cable from the substation to the property, you need to consult the network owner. The whole point of TT, is that it is what you do when there is no earth supplied, and for some good reason the neutral may not be used, either for reasons of voltage offset, or the security of the cable, and how great is risk of loss of neutral while live remains connected, such as with overhead single cables.