If the turn or river is exposed before the betting round is complete, then the exposed card is replaced in the deck. The deck is then reshuffled and a new turn or river dealt without first burning a card.
I"m sure this was also the rule the TD used in Edinburgh during the regional.
Correct Derek,
Identical situation at Edinburgh on Saturday, TD acted as above, which IMHO is a fairer way of doing it.
Geo.