Shepton Mallet Circular Handstamp

The entire below from 11th May 1839 illustrates the official 2d rate for up to 8 miles - as opposed to the unofficial and "illegal" 2d rate used on "short" Penny Post letters that did not go into the General Post.  The entire has a circular handstamp in blue (known in this colour from 1836-1842).

It was also used in black from 1843-1846 (and in red from 1833-1845 but I don't have an example of this).