(1) This Act other than -

(a) sections 11, 14 and 15, and

(b) section 6, in so far as it gives the force of law to Article 8(1) of the Model Law,

shall not apply to proceedings pursuant to the Washington Convention.

(2) In this section, "award" means an award rendered pursuant to the Washington Convention and includes any decision made -

(a) pursuant to Article 49(2) of that Convention in relation to any question which the Tribunal referred to in that Article had omitted to decide in the award, or in relation to the rectification of any clerical, arithmetical or similar error in the award,

(b) pursuant to Articles 50, 51 and 52 of that Convention, interpreting, revising or annulling the award, and

(c) pursuant to Article 61(2) of that Convention in relation to costs.