Private jets are surprisingly cheap - the guy who sits opposite me has a Marquis Card (the NetJets time-based subsidiary).

The US website puts the starting price at $110,000 for 25 hours flying time. That would equate to £60k but I think the UK ads I've seen say £75k.

Now, if you have 3 kids (as my colleague does) the cost difference is modest. Five Club returns to Nice on BA would be about £4,000. Four hours of Marquis time is £9,600 based on the $110 rate. Not a huge difference in the millionaire scheme of things.