Hi Graham,
We do offer flight upgrades, you will be able to see this on page 16-17 of the brochure. However, I would recommend speaking to one of our holiday advisors who will be able to give you loads of information.
For our tour departing in October 2015, we have 18 people booked on, with the ages ranging from early-30's to late-70's. 17 of these travellers are female which leaves one to be a male. This is quite a female 'heavy' group, and we find this with the majority of our tours.
In regards to international travellers, we do get some people from other countries on our tours, however our tours depart from the UK so they generally have to get to the UK beforehand.
I hope this helps and if you have anymore questions please do not hesitate to ask.
Kindest Regards,
Monty