Last night I play tested The Men Who Would be King (TMWWBK) rules from Osprey.
For a first game they ran very smoothly with only a few questions:-
Can you double, charge or move from heads down?
Is there a minimum unit size for breaking?
Is it cumulative casualties for pinning? (I doubt it)
Why doesn't everyone move at double, given the extra D6 movement bonus?
Should there be a charge bonus, or an attacking in rear modifier?