Lots of packet ham IS free on red and EE. If you have the syns directory there are millions (maybe an exaggeration) that are free in fact!
The M&S extra lean IS free and myself I count most wafer thin packet hams as free but I usually eat the Tesco or M&S ones.
Living in Spain its nearly impossible to get fresh ham like you do in the UK so have always used the packet stuff and it hasn't stopped my weight loss. I do tend to use the packet thin sliced chicken more though.