The poem is reproduced in "Reminiscences of a Chief Constable" by William Chadwick, page 88:
Though once beneath the ground his corpse was laid,
For use of surgeons it was thence conveyed;
Vain was the scheme to hide the impious theft,
The body taken; shroud and coffin left.
Ye wretches, who pursue this barbarous trade,
Your carcases in turn may be conveyed,
Like his, to some unfeeling surgeon's room,
Nor can they justly meet a better doom.
It is also reproduced on Carl's Cam. This is a useful website of considerable interest. The link to the site is
http://www.carlscam.com/ and you should click on 'Places' in the top left-hand corner, then click 'M', then scroll down to Mottram-in-Longdendale and choose 'St Michael's Church'. Choose 'Lewis Brierley' and the text should appear.
I thought you may all like to see this