Yes, Harber London does offer a site-wide discount code. There is a 15% off site-wide discount code available. Additionally, there are other discount codes such as an extra 5% off store-wide, an extra 10% off orders over $100, and an extra 10% off site-wide. Please note that these codes and offers may be subject to terms and conditions, and it's recommended to check the Harber London website for the most up-to-date information.