No expert on this but think there might be some hefty fines for not fulfilling a fixture.
31. CLUB SCRATCHING OR WITHDRAWING
A club which intends to scratch or withdraw from the Competition will give notice to the Secretary and to
the secretary of the club against which it is drawn, at least four days before the date fixed for playing the tie.
Any decision by a club to scratch or withdraw from the Competition may result in the matter being referred
to the Compliance Officer (as defined in the Judicial Panel Protocol) for investigation and possible sanction
in accordance with the Judicial Panel Protocol.