London Heathrow – Basel
BD161/LX4429 LHR0715 – 0950BSL 319 x7
BD167/LX4425 LHR1650 – 1925BSL 319 x7
BD167/LX4425 LHR1655 – 1930BSL 319 7
BD169/LX4427 LHR1925 – 2200BSL 319 x6
BD160/LX4420 BSL0725 – 0810LHR 319 x67
BD160/LX4420 BSL0730 – 0815LHR 319 6
BD162/LX4426 BSL1600 – 1640LHR 319 1
BD162/LX4426 BSL1610 – 1650LHR 319 x26
BD168/LX4428 BSL2030 – 2105LHR 319 x6
BD168/LX4428 BSL2050 – 2125LHR 319 6
Manchester – Basel
BD301/LX4431 MAN1215 – 1500BSL 319 x67
BD300/LX4430 BSL1050 – 1140MAN 319 x67
So by looks of it the MAN flights will operate as a W-pattern with the LHR a/c.