"Excellent service from Screwfix, no complaints at all. The product itself came with no information about wiring up. Couldn't find anything on-line so contacted the manufacturer directly and received the most appalling customer service. Failed to call back, hung up on me twice, refused to provide any information, even a basic wiring diagram. Wrote to MD, took 3 weeks to hear anything back and after three more calls was promised a diagram by email the same day.12 days later and still nothing."