Masonry wall panel design (BS5628): Why can I not have a panel supported by adjacent sides only?

The masonry wall panel calculation gives you a lot of variations of supporting sides however it doesn't cover a situation where only adjacent sides are supporting, i.e. bottom and left.

Solution

This is a limitation of the yield line approach used in the calculation. It is used to determine the moments in the wall and requires at least one pair of opposing supports. 

Note: This is not just a limitation of the Tedds calculation but is also not covered by the tables used in BS5628 or Eurocode.