Hi Helen
You are in for a treat! I did this tour in February this year and also February 2024. I'm also going back in February 2027 on the Travelsphere itinerary!
NZ is an amazing and friendly place.If you have a look in the Reviews section of the Forum, on the second page I think, you will find some hints and tips that I posted after my first trip.
My tours both departed from Heathrow but the Tour Director will probably either meet you at the gate at Gatwick if you don't have an included lounge pass or at your transit airport (we flew through Singapore). The JY group will be allocated seats in a similar area of the plane but, if you've booked an upgrade, I suggest waiting for the group at the top of the airbridge when you de-plane, because Business Class get off first. The Tour Director will probably be waving a Just You sign or clip board to round you all up!
Happy to help if you have any other questions.
Happy travels
MLB