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Thankshallots
@user75204 thanks very much for the replies, forgot to mention the wider bb, that's the one thing I was aware of.
It's for a touring bike so feels like a triple set-up would be appropriate, but just working out how best to source the parts if going that route. A compact might be enough in reality.
Useful to know about rear cog limitations with a medium reach mech. After more Googling it appears 1992 thru 2008, all ERGO were double and triple :)