You may find whole sellers and retailers at your local market; this is one of the best methods if you want to buy local and buy it fast.
You can also go for online listings of the items you need. One of the basic necessity for anyone who is buying catering equipment for sale is to look online; most of the sellers will have ads which will take you directly to their website.
You can find their catalogue as well as proper details about the equipment you need and the proper catering equipment supplies. Alternatively, you can check for customer to customer websites which will route you to people who are selling their commercial kitchen equipment.
Depending the type of equipment you want, whether new or used, there will be a slew of retailers as well as whole sellers who will fulfil your requirement.
Remember to make a proper list of the items you need and compare the prices online before investing; you can essentially safe a few hundred pounds because of it.