I actually think it makes sense to smarten up what is a very drab looking plane - and, like it or not, image counts.
(Although it's a bit galling to hear Brexiteers (who screamed about paying Brussels without acknowledging what an incredible return on investment those payments constituted) now trying to tell us the paint job is an investment, and will make us back money in trade).
...But £900,000!?
Apparently it costs £1-200,000 to paint a plane, but this £900,000 includes a refit too.
So £700,000-800,000 (3 x average house prices) is being spent to make sure Johnson has a cushy time aboard.
All aboard the gravy-plane!