Insufficient bid when it would be a cue bid
South is dealer and opens:
1H - 3C* - 3C
*Weak jump overcall.
Law 27B 1(a) says an insufficient bid may be "corrected by the lowest sufficient bid which specifies the same denomination(s) as that specified by the withdrawn call".
3C was intended as natural but N had not seen the intervening bid. N simply asked for his options and was advised 4C would be OK without further rectification.
This gives me pause for thought. The clubs split 0 - 6- 5 - 2. For N though is it reasonable to substitute 4C (cue bid) for 3C (intended as natural)? Presumably on the basis that no matter what was intended, the insufficient 3C is also a cue bid.
Or should the director consider that since the intention of the insufficient bid was to show clubs, but that 4C in the N/S system must be a cue bid, that partner is silenced? This would make more sense to me.
S has UI but did not take advantage as far as I am aware.