The company I work for is one of the largest parts supply companies in the country. We supply to motorfactors in the main and I have to say it is a problem keeping continued supply from even the biggest companies.
A lot are OE suppliers who make in batches but if there is a sudden up turn to the motor manufacturer on the production line they get first shout. We carry circa £50 million on the shelf at any time so we can overcome this problem without the trade knowing there is a shortage.
There are so many potential delays, anything made in China has a shipping delay and if you hit the Chinese new year wrong that can another reason and parts like the Maxi ball joint are not made in the quantities they used to be.
With specialist parts it is even worse as they are made in such small batches that again delays happen.
With Westfield, yes they are big by Kit car standards but small in most car respects so they could not hold the stock levels they would need to cover every thing. The OE cannot do that hence they have the VOR service to get things in.
As for pricing, as a club yes we all want to help members, but Westfield are a business, they need to make a profit and just because you can buy a polo rad cheap, is it the same as they supply. You would not believe how cheap I can buy them , but they are cheap for a reason. If you compare the price for a polo rad from VW the Westfield price will be reasonable.
From my view, I have never had any issue with the parts guy's and the service has been excellent over 14 years I have dealt with them with several builds.
I am not a supplier to Westfield but I have realistic expectations but if I have any issues with anything car on none car related, I find a phone call to a senior person, like Julian, works.