"activities cease to be carried out by a contractor on a client's behalf … and are carried out instead by another person ('a subsequent contractor') on the client's behalf; … and in which the conditions set out in para (3) are satisfied."
"The conditions referred to in paragraph 1(b) are that –(i) there is an organised grouping of employees situated in Great Britain which has as its principal purpose the carrying out of the activities concerned on behalf of the client; (ii) the client intends that the activities will, following the service provision change, be carried out by the transferee other than in connection with a single specific event or task of short-term duration."