Hi Fiona,
Welcome to the world of single travel! I do hope you have a wonderful time on your first trip with us.
There are 14 travellers booked on this tour so far and everyone will be flying from Heathrow, so you have nothing to worry about. I'm sure reading through the threads on the community, you know that you aren't the first person to feel nervous before taking this type of holiday, and I'm sure you won't be the last either!
Kindest regards,
Monty