I’ve been looking at doing Blore Heath as well and found Dudley to be a little confusing.
The Freezywater publications describe his badge as
“A grating of 3 traverse bars and 4 vertical bars Or”.
and his arms as:
“Quarterly 1&4 Or 2 lions passant regardant Azure. 2&3 Argent, a cross flory Azure”
Google searches throw up the green lion on yellow but seem to attribute it to various members of the Sutton family, including John. I’ll have a look around my other ref material later today and see if I’ve got anything better.