Hi Lucinda,
There are 3 women doing the tour alone, with another 2 women booked on the Vietnam add-on. This leaves 2 men who are booked on the add-on too.
The provisional flight times for Norway's Northern Lights and Huskies at New Year are:
On the 29th December you will be departing from Heathrow at 10.20, and you will arrive in Tromso at 18.10. This includes a stop in Oslo.
On the 2nd January, you will depart from Tromso at 11.45, and arrive back at Heathrow by 16.25. This journey also includes a stop in Oslo.
I hope this helps.
Kindest Regards,
Monty