. . . experiments in 1973 and 1974 at Tongwynlais in south Wales (Steward 1977b) showed that carbonaria was at an advantage to typical in this locality, and yet was only present at a low frequency (c.20%).Wells seems to have taken the words "this locality" in this sentence as referring to south Wales instead of to the rather more obvious and more limited vicinity of Tongwynlais. However, it is clear from the table appearing just two pages further on in Steward's article that the conditions he reported for Tongwylnais did not generalise to the whole of south Wales.