5. Where at the time of a service provision change there exists a collective agreement made by or on behalf of the transferor with a trade union recognised by the transferor in respect of any employee whose contract of employment is preserved by regulation 4(1) above, then—
(a)without prejudice to Article 26 of the 1992 Order (collective agreements presumed to be unenforceable in specified circumstances) that agreement, in its application in relation to the employee, shall, after the change, have effect as if made by or on behalf of the transferee with that trade union, and accordingly anything done under or in connection with it, in its application in relation to the employee, by or in relation to the transferor before the change, shall, after the change, be deemed to have been done by or in relation to the transferee; and
(b)any order made in respect of that agreement, in its application in relation to the employee, shall, after the change, have effect as if the transferee were a party to the agreement.