17(1)The regulations must provide for the issue of certificates evidencing the carrying on of the activities in a trading period.U.K.
(2)The regulations may provide for certificates to evidence the carrying on of the activities—
(a)by the participant in question,
(b)by another participant in the trading scheme, or
(c)by a third party authorised in accordance with the regulations to obtain certificates for the purposes of the scheme.
(3)The regulations must require each participant to have enough certificates at the end of each trading period to comply with the participant's obligations under the trading scheme.
(4)The regulations must contain provision for ensuring that certificates used by a participant for that purpose cannot be used by the participant for any other purpose.
(5)The regulations—
(a)may provide for the expiry of certificates after such period as may be specified in or determined in accordance with the regulations;
(b)may enable certificates to be cancelled by a person by whom they are held instead of being used for the purposes of a trading scheme.