Here is the rule which counts -
E5 The Board shall have the power to temporarily suspend, amend or add to the rules as circumstances may dictate from time to time, as it deems appropriate in its reasonable discretion, to facilitate the smooth running of the competition, or in order to ensure the League is capable of meeting any commitments put upon it under the terms of any contracts or agreements with other bodies or sponsors.
Edit - I see Bonnyrigg have included this rule in their statement just issued.