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See here for the detailed analysis narrative [WARNING - long page] or use the links below to go directly to the section of interest.
Below, highlighted in bold are the comparisons between the steel tape and laser measurement of The Mall calibration course. They eventually converged to within 34 mm of each other once errors which had been made in applying corrections to the steel tape result were identified. - a highly satisfactory outcome which demonstrates the capability of the laser method as an alternative to the steel tape method.