Companion tickets need to travel together?

If I use a companion ticket voucher to get a 2nd ticket - does the holder of the ticket have to fly on the same flights each way?

Thanks.

[Neil]

Yes they must be on the same flights.

[Nottingham Nick]

Yes.

See see website

Para 4.4.1.2 Companion tickets and free complimentary companion tickets must be for the same date and flight as that of the paying passenger.

Nick