Inclinometers are frequently used to measure structural deflections during construction of retaining walls and piles. Attempts have been made to calculate bending moments from wall profiles measured by inclinometers but there is inconsistency in the methods and sometimes results are not always reliable. In addition, the collection and analysis of site inclinometer data can be poor. During construction of the Channel Tunnel Rail Link, UK, a section of contiguous bored pile retaining wall has been monitored using various instrumentation. Inclinometer measurements of the wall profile were scrutinized carefully and the rigorous techniques used to eliminate errors are described in this paper. Bending moments calculated from both strain gauge measurements and from the wall profile measurements have been compared and show good agreement. Complications regarding the fitting of various types of curves to inclinometer data and whether the section is cracked or uncracked are discussed and solutions suggested.