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My original code didn't have enough &s to fill the table. I solved this by adding an empty multi-column box as the last cell. This then created the border line as expected. Previously no border was being created I presume becasue the environment hadn't seen enough cells being filled.

The last line ...

I am attempting some simple exercises from an old Latex manual and I have reproduced a table except the bottom right cell is missing the bottom half of the right border.

The cell is a nested multirow within a multicolumn declaration, that is, it is effectively a 2x2 cell with borders around the ...