There is no set layout to an allotment. Traditionally the method was to have straight lines of plants, row after row, but in recent years allotments are become more of a mix for leisure and gardening.
Visit your allotment at different times of day to work out where the sun rises and falls. You don’t want to erect a shed only to discover that it casts a shadow across your plot. Think about including an area to relax, it’s not all about growing food you know, but about enjoying the space with friends and allotment neighbours. Give yourself time to enjoy the space whether that’s with a glass of wine or a hot cuppa tea.
Check your tenancy rules as some sites only allow certain sizes of shed and may even have guidelines on where they should be build.An allotment with raised beds and divided into two by using a fence, keeping the vegetable and flower section in different areas.
Whatever layout you decide, it’s up to you, above all enjoy the space and the time you spend there.