Hi Sue,
I did this trip last year and I had an amazing time. I met a really wonderful group of people and the TM and the local support all looked after us really well. I think a review was posted by one of my fellow travellers when we came back.
Heathrow is like any big airport - but once you are checked in and have passed security I usually try to find someone central to sit down with a coffee and a good book in view of one of the gate boards and have always seemed to bump into a fellow traveller or two while waiting. So make sure to put your JY label on your hand luggage.
I really hope you enjoy the holiday as much as I did.
Kezzer
This is one of my all time favorite holidays...