We do work for NSN. The info on the parts supply you have may be a little out of date. NSN Supply all the parts and oil for service work carried out for their customers via euro car parts, You receive a box for each car thats booked in. You get paid a % handling charge for fitting the parts. It works out to about £2.50 on a sump full of oil and 0.50p ish on the filters. The 10% off the bottom line still applies though. You have to collect and deliver and wash and clean the vehicles but if you gear up for it you can still get some nice work from them and they pay regularly.

Hope this helps.