The surge in the value of assets held here is a direct reflection on the willingness of the UK to sell anything that moves to a foreign buyer with a big chequebook and the ability of foreign buyers to run the assets well after buying them.
The UK benefits, of course, from the influx of capital and skills but there is also a downside and we may be about to discover what it is.
The value of our assets in the rest of the world is now less than what the world owns here — and that would seem to limit the possibility for net investment income to recover to past levels.
But if it is not going to recover, there is nothing to fill the trade gap and finance our current standard of living. So clearly the situation is unsustainable in the long term.
We can hold the line for a while by borrowing the money needed to fill the gap and by selling even more of our British businesses but that merely prolongs, rather than halts, the slow slide to disaster. Something more needs to be done, but what?
Perhaps the Chancellor will have the answer in his forthcoming Autumn Statement.