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) water is absorbed into the porous material and is transported above the water line. Rising damp can be identified by a characteristic "tide mark" on the lower section of affected walls. This tide mark is caused by soluble salts (particularly nitrates and chlorides) contained in the groundwater. Due to the effects of evaporation these salts accumulate at the "peak" of the rising damp. The issue of rising damp has been a concern since ancient times. The Roman Architect Vitruvius referred to the problem of dampness rising up walls and advised on how to construct buildings to avoid the problem. Rising