For the benefits of you garage owner guys let me give you some suggestions to getting your parts quicker and more importantly right first time.
Getting parts quicker
1, Firstly try to get the same driver on your route from your preferred supplier. Ask for his drivers mobile number and call them to chase your bits, not the shop. Drivers waste alot of time stopping at garages smoking and having chat to the garage guys, this lengthens their run and delays your parts delivery. If chased direct they tend to get on with it. Also, often they are able to restructure their routes to move you up the ladder so to speak, but wont do this unless prompted by you the customer.
2, Secondly, speak to your parts supplier and tell them you have started ordering some bits from another supplier whose deliveries are out performing theirs. You dont want to switch suppliers so are flagging this to them beforehand.
How to get your parts right first time
1, Dont presume the parts guy knows what he is on about. Often they do, but little things like OE numbers off the old unit or diameters of discs and clutches on french cars help ID parts quicker. (Also whether vented or solids on discs).
Other useful info for parts guys...On french brakes, the make of the braking system fitted to the vehicle, Bendix, Lucas Girling, whether the pads have a central spring or "ears" and the shapes of rear wheel cylinders...either round or oval.
Running a parts supply business and serving my garage customers over the years i am happy to say we always get rave reviews for accuracy and customer service, i do demand though that my customers bully me to do better and feedback things they are not happy with.
Some behind the curtain info on "certain parts suppliers" who will remain nameless....knowingly booking out the wrong part when they dont have the right one in stock to tie the customer into them whilst they source the right one from somewhere else then apologising and shipping the correct one later on. (very naughty)
Having a stash of OE supplier make boxes without the stock and sticking cheap chinese parts in them and shipping them as that make and charging for the OE brand....(again very naughty)
This info above is designed to help you garage end users get better service from your suppliers..
Of course if you dealt with me in Liverpool (which you cant due to territory rulings within GSF) then you wouldnt have to chase your stuff or worry about it being right
Good luck with the new unit.....and Malcolm, speak to your parts supplier and get them to refer business to you. I do this alot for some of my customers and probably point 3 to 4 customers each their way each week. This is in their benefit as you then hopefully will spend more money with them
A parts supplier and a garage should have a two way working relationship....not just give me your money for parts

1993 Citroen xm 2.1td, silver/grey, bowling ball wheel trims, 210k and climbing...