(1) These Regulations may be cited as the Stamp Duty and Stamp Duty Reserve Tax (Investment Exchanges and Clearing Houses) Regulations 1997 and shall come into force on 20th October 1997.
(2) These Regulations shall have effect—
(a) as respects the charge to stamp duty, in relation to instruments executed on or after 20th October 1997;
(b) as respects the charge to stamp duty reserve tax—
(i) in the case of an agreement to transfer equity securities which is not conditional, where the agreement is made on or after 20th October 1997;
(ii) in the case of an agreement to transfer equity securities which is conditional, where the condition is satisfied on or after that date.