Ms Emma Hanrahan:

It would probably depend. Some providers have their own installers and in case that installer would be responsible for doing it. If, for example, I have bought something and a specific installer is not nominated, there are instructions in the box and I am to install it myself, then there is a clear intention from the trader for me to install it, so if there is an issue in that process that amounts to a nonconformity with the contract.