Cyteen, I do love that 'too tired to walk' thing. It is lovely.
I do think the 7pm setdown is a very English custom though. DD is down by 8 here and wakes at 7.45 ... Trying to put her down earlier when the human foghorn goes down at 8 would be impossible. She will go any time after seven though if she lets me know she is tired ...
Most of the other mums I know vary bedtimes around 8 o'clock, but nine is quite common. I often see my neighbours' toddler pottering along her dad on her way back from her grandparent's house after nine at the weekend.
I think people just use naps in different ways then ...
Steaky asked about it once when she was debating bedtimes and so I started asking around out of curiosity.
Still feeling vile here ... I woke myself up singing at 3am