Cheers guys - I suspected not.
I've acquired a hybrid which has the making of a perfect Audax / winter bike (for when fixed seems to much effort) - but flat bars? Hmmm.
Guard & rack fittings, guard clearance with 28s, road geometry, 700c, discs, 28" to 120" gears - seems perfect right up to the bars. Maybe it's not an issue though.