Several garden room suppliers have examples of their garden rooms on display at their workshops. In many cases, there will be multiple designs and sizes of garden room on display so that you can get a feel for your options.
This map will give you an idea of where the different companies are located. Scroll down the page for their contact details. The listings are in alphabetical order.
It is a wise idea to make an appointment to visit these show sites to avoid disappointment, but they will typically arrange a time to suit you.