I'm delighted to say that after spending a rainy weekend on a graphics programme I have drawn and labelled up some useful Suffolk maps. I've just uploaded two to my new 'resources' page - one indicating the state of Norfolk parishes c1850 with plenty of notes about changes to civil parishes, and the second showing these along with the 1837 Registration District boundaries and notes about those districts that were not just confined to Suffolk.
Hopefully these will be useful to others. Any mistakes are mine and if you let me know of any corrections - providing I can verify them - I will update the maps.
Next on the agenda is to produce later district maps and Poor Law Union maps which I'll upload as time allows.