I think I just phoned the spares line and asked. There don’t seem to be any minimum spend requirements like for other manufacturers. The discount I get is better than I got as a trade customer through the call centre. I use mine constantly as a definitive parts lookup but only order the occasional stuff for jobs not stocked by distributors or for which distributors over-charge. Delivery times are not fantastic but far quicker than placing a special order through a distributor.