Rising Damp to his belief in some aspect of Philip's lore: for example, the 'love wood' which fails to excite Miss Jones (in the 'Charisma' episode, first broadcast 1974). Philip is an intelligent, educated man (more so than the moderately educated Alan and Miss Jones), he is sophisticated and suave; this makes Rigsby suspicious of him, particularly as Miss Jones openly fancies him. Philip does not reciprocate Miss Jones's romantic interest. Croydon was not revealed to be the true birthplace of Philip until the film version of "Rising Damp" (1980). Don Warrington commented in Britain's 50 Best Sitcoms on Channel 4, that
Damp (structural) salt accumulations still persist. This suggests that rising damp is not always the cause for the water penetration. The Building Research Establishment (BRE) in its review concludes that rising damp is a real problem. According to Jurin's law the maximum height of rise is inversely proportional to the capillary radius. Taking a typical pore radius for building materials of 1 µm, Jurin's Law would give a maximum rise of about 15 m, however, due to the effects of evaporation, in practice the rise would be considerably lower. A physical model of rising damp was developed by Christopher Hall and William