About the viewings, both couples seemed fairly keen, although I know that could just be politeness!
The second couple were really nice too. Turns out they have a friend on the same road, so they know the area well. If I had to guess, my money's on them at the moment I think.
The viewings went well I think. I told them that I was going to show them round, then leave them to it to have a proper look themselves, and we did just that.
I think it worked well. The only problem was that I had intended to wait while they looked in the garden so they had access to all rooms, but it was raining. Never mind!
I forgot to give the first couple a brochure (damn!) but I remembered for the second. Waiting impatiently for feedback from the agent now :)