After much deliberation, I took the plunge and put a child seat on the cycle.
I have been out three times with the little one since getting it a week or so ago.
She started off being pretty nervous about the whole idea (she wasn't the only one), but judging from the squeals of delight and shouts of "Daddy, faster" when I picked up speed, I suspect she got over her intial jitters fairly quickly.
The cycle acts in a very different way to normal. Which is only to be expected with a 15kg child hanging off the back, I guess. And although moving the seat slightly forward to try to put the weight over the back hub made a huge difference, manouverability takes a hit as does the ability to maintain speed on hills.
One thing that hugely dissapointed me was that cars don't give any extra space or make much of an extra effort. Of course one would ideally like drivers not to be blase about my welfare, but when a small child is on the back, I had hoped for better. Some are great, but the vast majority carry on as if I was invisible, as per normal. With the reduced manouverability and speed, I got pretty angry with a couple of drivers - one who drove straight at me after waiting for a car to pass in front of me.
Some motorists' reactions do seem rather odd. I have had looks from them when transporting the child around. One motorist gave me a strange look as if to say "why on earth would you expose your child to this type of danger when there are morons like me driving?". Whilst they gave this look they were passing me on a pedestrian crossing as I was trying to move out to pass a parked car on the zig-zags. So they might have a point...