"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."