Of course the box was a great success so mainland Britain got one and it was in my neck of the woods
Here is the rest of the 2002 stamp set showing the different types of pillar boxes through time on a FDC produced by the Trollope Society, which unfortunately I do not own but when I first saw it portrayed have lusted after it ever since.
The envelopes surrounding Anthony Trollope are all addressed to characters from his novels.
The Victorians in their usual enthusiastic manner produced a great variety of pillar boxes until 1859 when the Post Office decided to standardise the design. The growing demand for roadside posting facilities also resulted in a cheaper method of meeting that desire, the installation of small wall boxes from 1857
Postie had just opened this one in Suffolk when I was passing by.
An entry to Sunday Stamps II theme of - Post Boxes or Postal Themed - more postings here