How should we deal with existing petitions already presented at court prior to 27 April?

You should speak to your advisors. We do not know presently how existing petitions will be dealt with by the Court. We do know that if any winding up order is made (based on a petition presented after 27 April), it could be found to be void and a creditor may face challenges. Even for petitions presented before 27th April, there is a risk that the Court will not be keen to make a winding up order so it is important that you look at the facts of your debt and weigh up all of the factors before deciding how to proceed.