Hi Gailtravels,
All dates except the 31st May departure have at least one traveller marked as a solo traveller, whether or not they already know any of those travelling as a pair I'm afraid I can't tell.
So...
May 10th : 2 solo travellers
Jun 21st: 1 solo traveller
Sep 6th: 3 solo travellers
Sep 20th: 1 solo traveller
One thing that you might be interested in knowing is that some of these dates (10 May, 21 Jun, 6 Sep) are part of the Travelsphere sale so you can save up to £50 if you book before 16th February 2015.
Kindest regards,
Julia