Why on earth did I dream about punctures last night? I'd spent a sunny day exploring various parts of south-east London without any trouble from the bike at all.
The reason for the exploring was to see the kinds of neighbourhoods where it seems to be possible to buy so much more space in a property than I've got for what my flat is approximately worth.
And I found out why it's possible: not the kind of neighbourhoods I'd want to live in, and not quite the possible retirement options I'd imagined. Perhaps that's what was punctured.