A great place to start your used van search is the VanMan. This is a UK company that specialises in buying, selling and renting vans, and is 'dedicated to securing the best deals for customers'. They have supplied vans to a large number of companies across the UK. Just click on their ‘Used Vans’ link, select your preferred model, make and price. You’ll need to put a deposit on a van first in order to secure it, and then you’ll receive an order pack in the mail. Full payment needs to be made prior to delivery.
Another great site is Vans United. These guys have more than 3,000 vans just waiting for you to check them out! Select the ‘used vans’ button in the search engine, choose the model, make and price of your choice and away you go! Take a look at the ‘Top Used Vans Search’ list at the bottom of their ‘About Us’ page to see what other like-minded van fans have been looking for! You can also read their van blog, to learn about other peoples’ experiences with used vans.