Clive Wolman explains why there may no longer be a valid legal basis for a company to be able to restrain the presentation, advertisement or pursuit of a winding-up petition against it merely by showing that it is genuinely and substantially disputing the petition debt. Changes in UK insolvency and company legislation, reinforced by changes in accounting standards and by judicial rulings, have led to a broader definition of a “contingent” debt or liability. It now includes the contingency of a court finding that the disputed debt or liability does exist.