>There's a quote from John Robert Seely - "We seem, as it were, to have conquered and peopled half the world in a fit of absence of mind". I always took that as "we really didn't know what we were doing."

That is a good way of looking at it. It's pretty much Capital Market expansion seeping into whatever cracks it found across the world. British merchants would find a neat port, and the navy and army would soon follow behind them (either to deny that area to European competitors, or to enforce the economic interests of the merchants through violence).

There was never any grand central plan or vision to it. No council of rulers sitting together in a room saying "we are going to forge a big empire!" Just the ruthless pursuit of financial interests leading them there over the years.