Not sure what ya mean by that Mark. The room being out of sqaure doesnt affest the joint as the joint always goes sqaure with the units which are put in square. Any alterations are made to the rear of the worktop/units to get over the out of squareness.

Unless you fit the units out of square which is rough

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In 22yrs of fitting kitchens whether it be 1k or 40k i have always fitted to the walls and then mitred the worktops to suit, the only time i have cut the back edge is to get over some moody plastering
Steve.