Hi Lynne,
OK, so for the main tour only there are 10 people booked two have booked the single room option and for the main tour with Iguacu Falls add-on, there are 6 people booked and again two travellers have booked the single room option.
Ages for the group as a whole range from late-fifties to early-eighties. It's almost 50/50 on the gender breakdown - three of the four in the whole group booked as singles are female.
On to flights: The reason some airports are listed more than once is the options relating to flight routings. So for example (I've just selected one date and it might be different on others), on the tour you have mentioned Newcastle appears in both lists as we have two routing options available. The regional flight will take you from Newcastle to London, London to Madrid, Madrid to Santiago. The direct flight for this tour will take you from Newcastle to Paris, Paris to Santiago.
I hope all of this information helps.
Kindest regards,
Julia