Have any studies been commissioned to examine the long-term effects of leakage repairs by Thames Water on building foundations? In 1992, extensive underpinning had to be installed to my house, which dates from 1865, following droughts in the late 1980s. Buildings in this area are founded on clay and my walls appeared to have crushed brick only at their base, leaving them vulnerable to changes in the water content of the clay.
Areas may have adapted to minor leakages over the years, the withdrawal of which may cause problems.
Richard Whatmoor (M), 43 Lancaster Road, London, W11 1QJ