The way I read it we have four options.1) Outside light fixed to the house, powered by an extension to a circuit not in a special location - not notifiable.
2) Outside light fixed to the house, powered by an extension to a circuit in a special location - notifiable.
3) Outside light not fixed to house (garden light to illuminate fish pond), powered by an extension to a circuit not in a special location - notifiable.
4} Outside light not fixed to house (garden light to illuminate fish pond), powered by an extension to a circuit in a special location - notifiable.
We need more info to answer the question