'I always wonder what might have been if we hadn’t had a child. Parents always wonder what might have been.' That’s parental ambivalence, the feeling at times ( when your child isn’t sleeping or is rolling around the floor in a supermarket, or generally exhausting you) that life would be so much better without a child. Mothers have it and fathers have it too. One of the places I got parental ambivalence was this BMX track by the River Avon in Bath. I’d take Isabel there because it fitted that odd-but-topographically-interesting landscape that she could run around in. And she would; she’d run round and round that BMX track, up and down the hills, and round again. I’d try to sit there but she’d cajole me like a six-year-old sergeant major at bootcamp. And I was too weak to say no. So I’d run round and get exhausted. And do it again. And again. And again…