http://www.crufts.org.uk/content/show-information/marketplace/this is a link to the trade stands there but there is usually a better list out a bit nearer - unless this is the 'new improved'!!! (less good) version.
As there are 5 halls all with trade stands, if I want to look for something specific I usually try to find the Hall/Stand number before hand as it is so easy to keep missing it. Alternatively you can buy a souvenir show guide which has a list of stands all under the relevant categories.
No break for lunch, you can take your own food or plenty of food places available in most of the halls- at a price! and long queues at peak lunch time!