In this Part—
“administrator”, in relation to a trading scheme, means a person appointed as the administrator of the scheme by regulations under paragraph 21 of Schedule 2;
“participant”, in relation to a trading scheme, means a person to whom the scheme applies by virtue of regulations under paragraph 4 or 15 of Schedule 2;
“trading period”, in relation to a trading scheme, means a period by reference to which the scheme is to operate by virtue of regulations under paragraph 2 or 13 of Schedule 2.