The issue of who is liable when parts supplied by a customer, but fitted by a business, fail, is one that results in regular disputes.
The major difficulty is not the law, which is relatively clear, but determining the precise cause and reason for the failure. The business is not liable for the direct failure of any parts they do not provide (that is the customer supplies the parts and requests they be fitted).
The business is liable for the services provided in fitting the parts, and ancillary to this can be liable if they do not ensure they inspect and correctly clean and fit the supplied part, or do not bring to the attention of the customer any concerns with respect to the part.
This will often rest on the particular facts and expert evidence as to the precise reason for the failure and whether the business should have notified the customer of a risk and did not do so.
If you need any advice in regards to customer supplied parts, contact the MTA’s WR team by clicking here.