“67 Challenging the award: substantive jurisdiction. (1) A party to arbitral proceedings may (upon notice to the other parties and to the tribunal) apply to the court— (a) challenging any award of the arbitral tribunal as to its substantive jurisdiction; … (3) On an application under this section challenging an award of the arbitral tribunal as to its substantive jurisdiction, the court may by order— (a) confirm the award, (b) vary the award, or (c) set aside the award in whole or in part.” (c) set aside the award in whole or in part.”
“Unless otherwise agreed by the parties, an arbitration agreement which forms or was intended to form part of another agreement (whether or not in writing) shall not be regarded as invalid, non-existent or ineffective because that other agreement is invalid, or did not come into existence or has become ineffective, and it shall for that purpose be treated as a distinct agreement.”