In message 01c884ac$c18c5520$LocalHost@default, Michael R N Dolbear
writes

Possibly, but blaming someone who died in 1882 when postal district
numbers didn't become part of postal addresses until 1932 or so seems
more legend than fact.

Well, it was Trollope who got the original Southern postal area removed,
resulting in Vauxhall becoming part of the SE London postal area in
1868. It became SE11 around 1917 and that was retained when postcodes
were introduced in the 1970s. So, while I wouldn't blame Trollope for
the subsequent retention of the anomaly, it all resulted from his
original recommendation.
--
Paul Terry