Im very lucky in my location and am able to drop by at the NOva showroom personally, sometimes once a week, to pick up articles.
I think that the reason they have been so sucessful, and continue to be, is because they sell stuff that nobosy else sells - and it is really well made and thought out designs.
The Man at the top - Robin Whetton, is a really interesting chap to have a chat with. He started the company in 1983 I think, and I know that John Sexton worked with thme on the design of their archival washers.
Recently they have started a new line called Permajet, which are brilliantly marketed inkjet papers (and I'm sure, as inkjet paper goes, brilliant inkjet paper) - not really for me or anyone else on this site, but I understand and support this from a business point of view. The nice thing is that the company does well from such products and continues to produce their darkroom products and their excellent catalogue.
I've been telling Mr Whetton to become a sponsor on this site.
Matt