Devon and Spam are quite different products....
Spam (Spiced Ham is where the name came from) tastes significantly different to Devon... Devon has a much smoother texture too...
Devon is also commonly thinly sliced... and is a "processed meat" product...
I love it...

...but I think Bismarks attributed comment about sausages applies...
"The less people know of how laws and sausages are made the better they will sleep at night"

P.S. Beetroot is obligatory on a burger! Especially when wearing a white shirt. Any Aussie can tell you why...lol