Edinburgh Council policy for A-Boards placed on pavement.  The full report can be found here – City of Edinburgh Council Report on A-Board Frames

In summary

• An unobstructed width of at least 1400mm must be provided
• One A-Board per premises
• May only be placed in front of the premises
• Set back from kerb of 45cm
• Should not exceed 1m tall by 0.75m wide
• Should be removed during hours of darkness or poor weather
• Should not be attached to street furniture
• If the premises hold a Tables and Chairs Permit, A-board must be displayed within the area allocated for tables and chairs.